36 Ophiuchi: Difference between revisions

Coordinates: Sky map 17h 15m 20.851s, −26° 36′ 09.04″
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{{short description|Triple star system in the constellation Ophiuchus}}
{{short description|Triple star system in the constellation Ophiuchus}}
{{more citations needed|date=January 2021}}
{{Sky|17|15|20.851|-|26|36|09.04|19.418}}
{{Starbox begin |
{{Starbox begin |
name=36 Ophiuchi A/B/C }}
name=36 Ophiuchi A/B/C }}
{{Starbox image
| image = [[Image:V2215OphLightCurve.png|350px]]
| caption = A [[Photometric system#Photometric letters|visual band]] [[light curve]] for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ''[[All Sky Automated Survey for SuperNovae|ASAS-SN]]'' data<ref name="ASAS-SN"/>
}}
{{Starbox observe |
{{Starbox observe |
epoch=J2000 |
epoch=J2000 |
constell=[[Ophiuchus]] |
constell=[[Ophiuchus]] |
ra=A:&nbsp;{{RA|17|15|20.851}}<br />B:&nbsp;{{RA|17|15|20.978}}<br />C:&nbsp;{{RA|17|16|13.3624}}<ref name="SIMBAD">{{cite web
ra=A:&nbsp;{{RA|17|15|20.851}}<br/>B:&nbsp;{{RA|17|15|20.978}}<br/>C:&nbsp;{{RA|17|16|13.3624}}<ref name="SIMBAD">{{cite web
| url=http://simbad.u-strasbg.fr/
| url=http://simbad.u-strasbg.fr/
| title=SIMBAD Astronomical Database
| title=SIMBAD Astronomical Database
| publisher=[[Centre de Données astronomiques de Strasbourg]]
| publisher=[[Centre de Données astronomiques de Strasbourg]]
| accessdate=2013-08-23
| access-date=2013-08-23
}}<br />
}}<br/>
* A: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155886 LHS 437 -- High proper-motion Star]
* A: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155886 LHS 437 -- High proper-motion Star]
* B: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155885 LHS 438 -- High proper-motion Star ]
* B: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20155885 LHS 438 -- High proper-motion Star ]
* C: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20156026 V* V2215 Oph -- Variable of RS CVn type]</ref>
* C: [http://simbad.u-strasbg.fr/simbad/sim-id?Ident=HD%20156026 V* V2215 Oph -- Variable of RS CVn type]</ref>
|
|
dec=A:&nbsp;{{DEC| -26|36|09.04}}<br />B:&nbsp;{{DEC| -26|36|10.18}}<br />C:&nbsp;{{DEC| -26|32|46.129}}<ref name="SIMBAD" /> |
dec=A:&nbsp;{{DEC| -26|36|09.04}}<br/>B:&nbsp;{{DEC| -26|36|10.18}}<br/>C:&nbsp;{{DEC| -26|32|46.129}}<ref name="SIMBAD"/> |
appmag_v=5.08/5.08/6.34<ref name="SIMBAD" /> }}
appmag_v=5.08/5.03/6.34<ref name="SIMBAD"/> }}
{{Starbox character |
{{Starbox character |
class=K2&nbsp;V/K1&nbsp;V/K5&nbsp;V<ref name="SIMBAD" /> |
class=K2&nbsp;V/K1&nbsp;V/K5&nbsp;V<ref name="SIMBAD"/> |
b-v=0.86(AB)/1.15 |
b-v=0.85(AB)/1.16 |
u-b=0.51(AB)/1.04 |
u-b=0.51(AB)/1.04 |
variable=C: [[RS Canum Venaticorum variable|RS CV]] }}
variable=C: [[RS Canum Venaticorum variable|RS CVn]] }}
{{Starbox astrometry |
{{Starbox astrometry
| component1 = 36 Oph A
radial_v=-0.6/0.0/-1.6<ref name="SIMBAD" /> |
prop_mo_ra=-488.2/-473/-480.06<ref name="SIMBAD" /> |
| radial_v=−0.6<ref name="SIMBAD"/>
prop_mo_dec=-1156.0/-1143/-1123.48<ref name="SIMBAD" /> |
| prop_mo_ra={{val|-498.600|0.123}}<ref name="GaiaEDR3a"/>
| prop_mo_dec={{val|-1149.158|0.086}}<ref name="GaiaEDR3a"/>
parallax=167.1 |
| parallax=168.0031
p_error=1.1 |
| p_error=0.1343
parallax_footnote=<ref name="SIMBAD" /> |
| parallax_footnote=<ref name="GaiaEDR3a">{{Cite Gaia EDR3|4109030160308320128}}</ref>
absmag_v= }}
| absmag_v=
| component2 = 36 Oph B
| radial_v2=0.0<ref name="SIMBAD"/>
| prop_mo_ra2={{val|-465.861|0.111}}<ref name="GaiaEDR3b"/>
| prop_mo_dec2={{val|-1141.168|0.073}}<ref name="GaiaEDR3b"/>
| parallax2=168.1303
| p_error2=0.1081
| parallax_footnote2=<ref name="GaiaEDR3b">{{Cite Gaia EDR3|4109030160308317312}}</ref>
| absmag_v2=
}}
{{Starbox astrometry|no_heading=y
| component1 = 36 Oph C
| radial_v={{val|-0.04|0.22}}<ref name="GaiaEDR3c"/>
| prop_mo_ra={{val|-479.573|0.031}}<ref name="GaiaEDR3c"/>
| prop_mo_dec={{val|-1124.332|0.020}}<ref name="GaiaEDR3c"/>
| parallax=167.9617
| p_error=0.0311
| parallax_footnote=<ref name="GaiaEDR3c">{{Cite Gaia EDR3|4109034455276324608}}</ref>
| absmag_v=
}}
{{Starbox visbin
{{Starbox visbin
| name=36 Ophiuchi B
| name=36 Ophiuchi B
Line 36: Line 62:
| eccentricity=0.922
| eccentricity=0.922
| inclination=99.6
| inclination=99.6
| node=-83.6
| node=−83.6
| periastron=1763.39
| periastron=1,763.39
}}
}}
{{Starbox detail
{{Starbox detail
| component1 = 36 Oph A/B
| component1 = 36 Oph A/B
| age_gyr = 0.6-1.8<ref name="search"/><ref name="MH08"/>
| age_gyr = 0.6-1.8<ref name="search"/><ref name="MH08"/>
| metal = B: {{nowrap|–0.31 ± 0.042<ref name=apjs161_2_444T/> [[Decimal exponent|dex]]}}
| metal = B: {{nowrap|–0.31 ± 0.042<ref name=apjs161_2_444T/> [[Decimal exponent|dex]]}}
| metal_fe = A: –0.20<ref name=aaa505_1_205/>
| metal_fe = A: –0.20<ref name=aaa505_1_205/>
Line 48: Line 74:
| rotation =
| rotation =
| luminosity_bolometric = 0.33/0.36<ref name="lumbol" group="note">From ''L''=4π''R''<sup>2</sup>σ''T''<sub>eff</sub><sup>4</sup>, where ''L'' is the luminosity, ''R'' is the radius, ''T''<sub>eff</sub> is the effective surface temperature and ''σ'' is the [[Stefan–Boltzmann constant]].</ref>
| luminosity_bolometric = 0.33/0.36<ref name="lumbol" group="note">From ''L''=4π''R''<sup>2</sup>σ''T''<sub>eff</sub><sup>4</sup>, where ''L'' is the luminosity, ''R'' is the radius, ''T''<sub>eff</sub> is the effective surface temperature and ''σ'' is the [[Stefan–Boltzmann constant]].</ref>
| luminosity_visual = 0.28/0.27
| luminosity_visual = 0.28/0.30
| temperature = {{nowrap|4,843 ± 134}}<ref name=aaa505_1_205/>/{{nowrap|4,985 ± 20}}<ref name=apjs161_2_444T/>
| temperature = {{nowrap|4,843 ± 134}}<ref name=aaa505_1_205/>/{{nowrap|4,985 ± 20}}<ref name=apjs161_2_444T/>
| component2 = 36 Oph C
| component2 = 36 Oph C
| metal2 = 46-100% Sun
| metal2 = 46–100% Sun
| mass2 = 0.71
| mass2 = 0.71
| radius2 = 0.72
| radius2 = 0.72
| luminosity_bolometric2 = 0.20<ref name="lumbol" group="note" />
| luminosity_bolometric2 = 0.20<ref name="lumbol" group="note"/>
| luminosity_visual2 = 0.09
| luminosity_visual2 = 0.09
| temperature2 = 4,550
| temperature2 = 4,550
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=36 Oph, [[Washington Double Star Catalog|WDS]]&nbsp;J17153-2636
| names=36 Oph, Guniibuu (star A), [[Gliese-Jahreiss catalogue|GJ]] 663 AB and 664, [[Harvard Revised catalogue|HR]] 6402/6401/-, [[Cordoba Durchmusterung|CD]] CD-26°12026, [[Henry Draper catalogue|HD]] 155886/155885/156026, [[General Catalogue of Trigonometric Parallaxes|GCTP]] 3908.00 AB/3913.00, [[Luyten Half-Second catalogue|LHS]] 437/438/439, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 185198/185199/185213, [[Hipparcos catalogue|HIP]] 84405/84478, [[Gaia (spacecraft)|Gaia DR2]] 4109030160308320128 / 4109030160308317312 / 4109034455276324608. }}
| component1 = AB
| names1=[[Gliese Catalogue of Nearby Stars|GJ]]&nbsp;663, [[Cordoba Durchmusterung|CD]]−26°12026, [[General Catalogue of Trigonometric Parallaxes|GCTP]]&nbsp;3908.00, [[Hipparcos catalogue|HIP]]&nbsp;84405
| component2 = A
| names2=Guniibuu, [[Bright Star Catalogue|HR]]&nbsp;6402, [[Henry Draper Catalogue|HD]]&nbsp;155886, [[Luyten Half-Second catalogue|LHS]]&nbsp;437, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;185198
| component3 = B
| names3=[[Bright Star Catalogue|HR]]&nbsp;6401, [[Henry Draper Catalogue|HD]]&nbsp;155885, [[Luyten Half-Second catalogue|LHS]]&nbsp;438, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;185199
| component4 = C
| names4=[[Variable star designation|V2215]]&nbsp;Ophiuchi, [[Gliese Catalogue of Nearby Stars|GJ]]&nbsp;664, [[Cordoba Durchmusterung|CD]]−26°12036, [[Henry Draper Catalogue|HD]]&nbsp;156026, [[General Catalogue of Trigonometric Parallaxes|GCTP]]&nbsp;3913.00, [[Luyten Half-Second catalogue|LHS]]&nbsp;439, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;185213, [[Hipparcos catalogue|HIP]]&nbsp;84478

}}
{{Starbox reference
{{Starbox reference
| Simbad = *+36+Oph|sn=AB
| Simbad = *+36+Oph|sn=AB
Line 71: Line 107:
| ARICNS2 = 01380|an2=B
| ARICNS2 = 01380|an2=B
| ARICNS3 = 01381|an3=C
| ARICNS3 = 01381|an3=C
}}
{{Starbox image
|image={{Location map|100x100|AlternativeMap=Ophiuchus_constellation_map.svg
|alt=36 Ophiuchi is located in the constellation Ophiuchus
|caption=Location of 36 Ophiuchi in the constellation [[Ophiuchus]]|border=infobox|mark=Red_circle.svg|width=350
|label=36
|position=top
|lat=17.5
|long=51.3
}}|caption=
}}
}}
{{Starbox end}}
{{Starbox end}}
'''36 Ophiuchi''', formally named '''Guniibuu''' {{IPAc-en|g|@|'|n|iː|b|uː}}, is a [[triple star]] system 19.5 [[light year]]s from [[Earth]]. It is in the constellation [[Ophiuchus]].


'''36 Ophiuchi''' (or '''Guniibuu''' for component A) is a triple [[star system]] 19.5 [[light-year]]s from [[Earth]]. It is in the [[constellation]] [[Ophiuchus]].
The primary and secondary stars are nearly identical orange [[main sequence]] dwarfs of [[spectral type]] K2/K1; the tertiary star is an orange [[main sequence]] dwarf of [[spectral type]] K5.

The primary and secondary stars (also known as HD 155886) are nearly identical orange [[main-sequence]] dwarfs of [[spectral type]] K2/K1. This binary is unusual because its eruptions do not seem to conform to the Waldmeier effect; that is, the strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.<ref>{{citation|arxiv=1909.12148|year=2019|title=Waldmeier Effect in Stellar Cycles|doi=10.3847/1538-4357/ab4a17|last1=Garg|first1=Suyog|last2=Karak|first2=Bidya Binay|last3=Egeland|first3=Ricky|last4=Soon|first4=Willie|last5=Baliunas|first5=Sallie|journal=The Astrophysical Journal|volume=886|issue=2|page=132|bibcode=2019ApJ...886..132G|s2cid=202888617 |doi-access=free }}</ref> The tertiary star is an orange main-sequence dwarf of [[spectral type]] K5.


Star C is separated from the A-B pair by 700 [[arc second]]s, compared to a minimum of 4.6 arcsec for A-B, so its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s.
Star C is separated from the A-B pair by 700 [[arcseconds]], compared to a minimum of 4.6 arcseconds for A-B, so its effect on the movements of the A-B pair is small. A and B have active [[chromosphere]]s.
At present the distance between the stars forming the AB-pair is 5.1 arcseconds and the position angle is 139 degrees, while star C is 731.6 arcseconds away from the A-component and situated at a position angle of 74 degrees.


==Nomenclature==
==Nomenclature==


In the [[Kamilaroi]] and [[Euahlayi]] Aboriginal peoples in modern-day [[New South Wales]], Australia, the star A is called ''Guniibuu'' that represents the mythological robin red-breast bird. In 2016, the IAU organized a [[IAU Working Group on Star Names|Working Group on Star Names]] (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|accessdate=17 September 2018}}</ref> to catalog and standardize proper names for stars. The WGSN approved the name ''Guniibuu'' for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-CSN">{{Cite web
In the beliefs of the [[Kamilaroi]] and [[Euahlayi]] Aboriginal peoples in [[New South Wales]], Australia, the star A is called ''Guniibuu'' that represents the robin red-breast bird ([[scarlet robin|''Petroica boodang'']]). In 2016, the [[IAU]] organized a [[Working Group on Star Names]] (WGSN)<ref name="WGSN">{{cite web | url=https://www.iau.org/science/scientific_bodies/working_groups/280/ | title=IAU Working Group on Star Names (WGSN)|access-date=17 September 2018}}</ref> to catalog and standardize proper names for stars. The WGSN approved the name ''Guniibuu'' for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.<ref name="IAU-CSN">{{Cite web
|url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt
|url=http://www.pas.rochester.edu/~emamajek/WGSN/IAU-CSN.txt
|title=IAU Catalog of Star Names
|title=IAU Catalog of Star Names
|publisher=[[International Astronomical Union]]
|publisher=[[International Astronomical Union]]
|accessdate=2018-09-17}}</ref>
|access-date=2018-09-17}}</ref>


==Hunt for substellar objects==
==Hunt for substellar objects==
The [[McDonald Observatory]] team has set limits to the presence of one or more planets<ref name="search" /> around 36 Ophiuchi A with masses between 0.13 and 5.4 [[Jupiter masses]] and average separations spanning between 0.05 and 5.2 [[astronomical units]], although beyond 1.5 [[Astronomical Units|AU]] orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.<ref name="Irwin">Irwin ''et al.'' (1996).</ref>
The [[McDonald Observatory]] team has set limits to the presence of one or more planets<ref name="search"/> around 36 Ophiuchi A with masses between 0.13 and 5.4 [[Jupiter mass]]es and average separations spanning between 0.05 and 5.2 [[astronomical unit]]s (AU), although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.<ref name="Irwin">Irwin ''et al.'' (1996).</ref>


The star C (or namely HD 156026) is among five nearby paradigms as [[K-type star]]s of a type in a 'sweet spot’ between Sun-analog stars and [[M-class star|M stars]] for the likelihood of evolved life, per analysis of Giada Arney from [[NASA]]'s [[Goddard Space Flight Center]].<ref name=Nasa2019-03-07/>
==See also==
* [[Stars and planetary systems in fiction#36 Ophiuchi|36 Ophiuchi in fiction]]


== Notes ==
==In culture==
A fictional planet called Giedi Prime around 36 Ophiuchi B is in the science-fiction novel [[Dune (novel)|Dune]] the homeworld of the House of Harkonnen.

==Notes==
{{reflist|group=note}}
{{reflist|group=note}}


==References==
==References==

<ref name="ASAS-SN">{{cite web |url=https://asas-sn.osu.edu/variables/lookup |website=ASAS-SN Variable Stars Database|title=ASAS-SN Variable Stars Database|publisher=ASAS-SN |access-date=6 January 2022}}</ref>

{{Reflist|refs=
{{Reflist|refs=
<ref name=Nasa2019-03-07>
{{cite news
| url = https://www.nasa.gov/feature/goddard/2019/k-star-advantage
| title = "Goldilocks" Stars May Be "Just Right" for Finding Habitable Worlds
| work = [[NASA]]
| author = Bill Steigerwald
| date = 2019-03-07
| access-date = 2020-05-12
| quote = {{'}}I find that certain nearby K stars like 61 Cyg A/B, Epsilon Indi, Groombridge 1618, and HD 156026 may be particularly good targets for future biosignature searches,{{'}} said Arney.
}}
</ref>


<ref name=aaa505_1_205>{{cite journal
<ref name=aaa505_1_205>{{citation | display-authors=1 | last1=Demory | first1=B.-O. | last2=Ségransan | first2=D. | last3=Forveille | first3=T. | last4=Queloz | first4=D. | last5=Beuzit | first5=J.-L. | last6=Delfosse | first6=X. | last7=di Folco | first7=E. | last8=Kervella | first8=P. | last9=Le Bouquin | first9=J.-B. |date=October 2009 | title=Mass-radius relation of low and very low-mass stars revisited with the VLTI | journal=Astronomy and Astrophysics | volume=505 | issue=1 | pages=205–215 | doi=10.1051/0004-6361/200911976 | bibcode=2009A&A...505..205D |arxiv = 0906.0602 }}</ref>
| title=Mass-radius relation of low and very low-mass stars revisited with the VLTI
| journal=Astronomy and Astrophysics | volume=505 | issue=1
| date=October 2009 | pages=205–215
| doi=10.1051/0004-6361/200911976
| bibcode=2009A&A...505..205D |arxiv = 0906.0602
|last1=Demory |first1=Brice-Olivier
|last2=Ségransan |first2=Damien
|last3=Forveille |first3=Thierry
|last4=Queloz |first4=Didier
|last5=Beuzit |first5=Jean-Luc
|last6=Delfosse |first6=Xavier
|last7=Di Folco |first7=Emmanuel
|last8=Kervella |first8=Pierre
|last9=Le Bouquin |first9=Jean-Baptiste
|last10=Perrier |first10=Christian
|last11=Benisty |first11=Myriam
|last12=Duvert |first12=Gilles
|last13=Hofmann |first13=Karl-Heinz
|last14=Lopez |first14=Bruno
|last15=Petrov |first15=Romain
|s2cid=14786643
}}</ref>


<ref name=apjs161_2_444T>{{citation | last=Taylor | first=B. J. |date=December 2005 | title=Statistical Cataloging of Archival Data for Luminosity Class IV-V Stars. III. The Epoch 2004 [Fe/H] and Temperature Catalogs | url=http://iopscience.iop.org/0067-0049/161/2/444/fulltext/ | journal=[[The Astrophysical Journal|The Astrophysical Journal Supplement Series]] | volume=161 | issue=2 | pages=444–455 | doi=10.1086/496885 | bibcode=2005ApJS..161..444T |postscript=. }}[http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ52d212351f95&-out.add=.&-source=J/ApJS/161/444/catalog&recno=857 Vizier catalog entry]</ref>
<ref name=apjs161_2_444T>{{citation | last=Taylor | first=B. J. |date=December 2005 | title=Statistical Cataloging of Archival Data for Luminosity Class IV-V Stars. III. The Epoch 2004 [Fe/H] and Temperature Catalogs | journal=[[The Astrophysical Journal|The Astrophysical Journal Supplement Series]] | volume=161 | issue=2 | pages=444–455 | doi=10.1086/496885 | bibcode=2005ApJS..161..444T |postscript=. | doi-access=free }}[http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ52d212351f95&-out.add=.&-source=J/ApJS/161/444/catalog&recno=857 Vizier catalog entry]</ref>
<ref name="search">Wittenmeyer ''et al.'' (2006).</ref>
<ref name="search">Wittenmeyer ''et al.'' (2006).</ref>


<ref name="MH08">{{Citation | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 |date=November 2008}}</ref>
<ref name="MH08">{{Citation | last1=Mamajek | first1=Eric E. | last2=Hillenbrand | first2=Lynne A. | title=Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics | journal=The Astrophysical Journal | volume=687 | issue=2 | pages=1264–1293 | doi=10.1086/591785 | bibcode=2008ApJ...687.1264M |arxiv = 0807.1686 |date=November 2008| s2cid=27151456 }}</ref>


}}
}}


==Further reading==
==Further reading==
*{{Citation |last=Irwin |first=Alan W. |last2=Yang |first2=Stephenson L. S. |last3=Walker |first3=Gordon A. H. |lastauthoramp=yes |date=1996 |title=36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities |journal=Publications of the Astronomical Society of the Pacific |volume=108 |pages=580 |doi=10.1086/133768 |bibcode=1996PASP..108..580I}}
*{{Citation |last1=Irwin |first1=Alan W. |last2=Yang |first2=Stephenson L. S. |last3=Walker |first3=Gordon A. H. |name-list-style=amp |date=1996 |title=36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities |journal=Publications of the Astronomical Society of the Pacific |volume=108 |pages=580 |doi=10.1086/133768 |bibcode=1996PASP..108..580I|doi-access=free }}
*{{Citation |last=Cayrel de Strobel |first=G. |last2=Lebreton |first2=Y. |last3=Perrin |first3=M.-N. |last4=Cayrel |first4=R. |lastauthoramp=yes |date=1989 |title=A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi |journal=Astronomy and Astrophysics |volume=225 |issue=2 |pages=369–380 |bibcode = 1989A&A...225..369C }}
*{{Citation |last1=Cayrel de Strobel |first1=G. |last2=Lebreton |first2=Y. |last3=Perrin |first3=M.-N. |last4=Cayrel |first4=R. |name-list-style=amp |date=1989 |title=A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi |journal=Astronomy and Astrophysics |volume=225 |issue=2 |pages=369–380 |bibcode = 1989A&A...225..369C }}
*{{Citation |last=Wittenmeyer |first=R. A. |last2=Endl |first2=Michael |last3=Cochran |first3=William D. |last4=Hatzes |first4=Artie P. |last5=Walker |first5=G. A. H. |last6=Yang |first6=S. L. S. |last7=Paulson |first7=Diane B. |lastauthoramp=yes |date=2006 |title=Detection Limits from the McDonald Observatory Planet Search Program |journal=Astronomical Journal |volume=132 |issue=1 |pages=177–188 |doi=10.1086/504942 |bibcode=2006AJ....132..177W|arxiv = astro-ph/0604171 }}
*{{Citation |last1=Wittenmeyer |first1=R. A. |last2=Endl |first2=Michael |last3=Cochran |first3=William D. |last4=Hatzes |first4=Artie P. |last5=Walker |first5=G. A. H. |last6=Yang |first6=S. L. S. |last7=Paulson |first7=Diane B. |name-list-style=amp |date=2006 |title=Detection Limits from the McDonald Observatory Planet Search Program |journal=Astronomical Journal |volume=132 |issue=1 |pages=177–188 |doi=10.1086/504942 |bibcode=2006AJ....132..177W|arxiv = astro-ph/0604171 |s2cid=16755455 }}
*{{Citation |last=Barnes |first=Sydney A. |date=2007 |title=Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors |journal=The Astrophysical Journal |volume=669 |issue=2 |pages=1167–1189 |doi=10.1086/519295 |bibcode=2007ApJ...669.1167B|arxiv = 0704.3068 }}
*{{Citation |last=Barnes |first=Sydney A. |date=2007 |title=Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors |journal=The Astrophysical Journal |volume=669 |issue=2 |pages=1167–1189 |doi=10.1086/519295 |bibcode=2007ApJ...669.1167B|arxiv = 0704.3068 |s2cid=14614725 }}


==External links==
==External links==
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work=SolStation |
work=SolStation |
url=http://www.solstation.com/stars/36ophiu3.htm |
url=http://www.solstation.com/stars/36ophiu3.htm |
accessdate=3 November 2005 }}
access-date=3 November 2005 }}
* https://arxiv.org/abs/astro-ph/0604171
* https://arxiv.org/abs/astro-ph/0604171
{{Nearest systems|4}}
{{Nearest systems|4}}
{{Stars of Ophiuchus}}
{{Stars of Ophiuchus}}


{{DEFAULTSORT:36 Ophiuchi}}
[[Category:Ophiuchus (constellation)]]
[[Category:Ophiuchus]]
[[Category:Triple star systems]]
[[Category:Triple star systems]]
[[Category:Flamsteed objects|Ophiuchi, 36]]
[[Category:Flamsteed objects|Ophiuchi, 36]]
[[Category:K-type main-sequence stars]]
[[Category:K-type main-sequence stars]]
[[Category:Solar-type stars|Ophiuchi, 36]]
[[Category:Solar-type stars|Ophiuchi, 36]]
[[Category:HR objects|6401 2]]
[[Category:Bright Star Catalogue objects|6401 2]]
[[Category:Henry Draper Catalogue objects|155885 5886 6026]]
[[Category:Henry Draper Catalogue objects|155885 5886 6026]]
[[Category:Hipparcos objects|084405 78]]
[[Category:Hipparcos objects|084405 78]]
[[Category:Durchmusterung objects]]
[[Category:Durchmusterung objects|CD-26 12026]]
[[Category:Bayer objects|Ophiuchi, A]]
[[Category:Bayer objects|Ophiuchi, A]]
[[Category:RS Canum Venaticorum variables]]
[[Category:RS Canum Venaticorum variables]]
[[Category:Gliese and GJ objects|0663 4]]
[[Category:Gliese and GJ objects|0663 4]]
[[Category:Objects with variable star designations|Ophiuchi, V2215]]

Latest revision as of 08:15, 13 March 2024

36 Ophiuchi A/B/C

A visual band light curve for 36 Ophiuchi C (V2215 Ophiuchi), plotted from ASAS-SN data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Ophiuchus
Right ascension A: 17h 15m 20.851s
B: 17h 15m 20.978s
C: 17h 16m 13.3624s[2]
Declination A: −26° 36′ 09.04″
B: −26° 36′ 10.18″
C: −26° 32′ 46.129″[2]
Apparent magnitude (V) 5.08/5.03/6.34[2]
Characteristics
Spectral type K2 V/K1 V/K5 V[2]
U−B color index 0.51(AB)/1.04
B−V color index 0.85(AB)/1.16
Variable type C: RS CVn
Astrometry
36 Oph A
Radial velocity (Rv)−0.6[2] km/s
Proper motion (μ) RA: −498.600±0.123[3] mas/yr
Dec.: −1149.158±0.086[3] mas/yr
Parallax (π)168.0031 ± 0.1343 mas[3]
Distance19.41 ± 0.02 ly
(5.952 ± 0.005 pc)
36 Oph B
Radial velocity (Rv)0.0[2] km/s
Proper motion (μ) RA: −465.861±0.111[4] mas/yr
Dec.: −1141.168±0.073[4] mas/yr
Parallax (π)168.1303 ± 0.1081 mas[4]
Distance19.40 ± 0.01 ly
(5.948 ± 0.004 pc)
36 Oph C
Radial velocity (Rv)−0.04±0.22[5] km/s
Proper motion (μ) RA: −479.573±0.031[5] mas/yr
Dec.: −1124.332±0.020[5] mas/yr
Parallax (π)167.9617 ± 0.0311 mas[5]
Distance19.418 ± 0.004 ly
(5.954 ± 0.001 pc)
Orbit
Companion36 Ophiuchi B
Period (P)568.9 yr
Semi-major axis (a)14.7″
Eccentricity (e)0.922
Inclination (i)99.6°
Longitude of the node (Ω)−83.6°
Periastron epoch (T)1,763.39
Details
36 Oph A/B
Mass0.85/0.85 M☉
Radius0.817 ± 0.016[6]/0.81 R☉
Luminosity (bolometric)0.33/0.36[note 1] L☉
Luminosity (visual, LV)0.28/0.30 L☉
Temperature4,843 ± 134[6]/4,985 ± 20[7] K
MetallicityB: –0.31 ± 0.042[7] dex
Metallicity [Fe/H]A: –0.20[6] dex
Age0.6-1.8[8][9] Gyr
36 Oph C
Mass0.71 M☉
Radius0.72 R☉
Luminosity (bolometric)0.20[note 1] L☉
Luminosity (visual, LV)0.09 L☉
Temperature4,550 K
Metallicity46–100% Sun
Other designations
36 Oph, WDS J17153-2636
AB: GJ 663, CD−26°12026, GCTP 3908.00, HIP 84405
A: Guniibuu, HR 6402, HD 155886, LHS 437, SAO 185198
B: HR 6401, HD 155885, LHS 438, SAO 185199
C: V2215 Ophiuchi, GJ 664, CD−26°12036, HD 156026, GCTP 3913.00, LHS 439, SAO 185213, HIP 84478
Database references
SIMBADAB
A
B
C
Exoplanet ArchiveA
B
C
ARICNSA
B
C
36 Ophiuchi is located in the constellation Ophiuchus
36 Ophiuchi is located in the constellation Ophiuchus
36
Location of 36 Ophiuchi in the constellation Ophiuchus

36 Ophiuchi (or Guniibuu for component A) is a triple star system 19.5 light-years from Earth. It is in the constellation Ophiuchus.

The primary and secondary stars (also known as HD 155886) are nearly identical orange main-sequence dwarfs of spectral type K2/K1. This binary is unusual because its eruptions do not seem to conform to the Waldmeier effect; that is, the strongest eruptions of HD 155886 are not the ones characterized by the fast eruption onset.[10] The tertiary star is an orange main-sequence dwarf of spectral type K5.

Star C is separated from the A-B pair by 700 arcseconds, compared to a minimum of 4.6 arcseconds for A-B, so its effect on the movements of the A-B pair is small. A and B have active chromospheres. At present the distance between the stars forming the AB-pair is 5.1 arcseconds and the position angle is 139 degrees, while star C is 731.6 arcseconds away from the A-component and situated at a position angle of 74 degrees.

Nomenclature[edit]

In the beliefs of the Kamilaroi and Euahlayi Aboriginal peoples in New South Wales, Australia, the star A is called Guniibuu that represents the robin red-breast bird (Petroica boodang). In 2016, the IAU organized a Working Group on Star Names (WGSN)[11] to catalog and standardize proper names for stars. The WGSN approved the name Guniibuu for the star A on 10 August 2018 and it is now so included in the List of IAU-approved Star Names.[12]

Hunt for substellar objects[edit]

The McDonald Observatory team has set limits to the presence of one or more planets[8] around 36 Ophiuchi A with masses between 0.13 and 5.4 Jupiter masses and average separations spanning between 0.05 and 5.2 astronomical units (AU), although beyond 1.5 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.[13]

The star C (or namely HD 156026) is among five nearby paradigms as K-type stars of a type in a 'sweet spot’ between Sun-analog stars and M stars for the likelihood of evolved life, per analysis of Giada Arney from NASA's Goddard Space Flight Center.[14]

In culture[edit]

A fictional planet called Giedi Prime around 36 Ophiuchi B is in the science-fiction novel Dune the homeworld of the House of Harkonnen.

Notes[edit]

  1. ^ a b From L=4πR2σTeff4, where L is the luminosity, R is the radius, Teff is the effective surface temperature and σ is the Stefan–Boltzmann constant.

References[edit]

[1]

  1. ^ a b "ASAS-SN Variable Stars Database". ASAS-SN Variable Stars Database. ASAS-SN. Retrieved 6 January 2022.
  2. ^ a b c d e f "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2013-08-23.
  3. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  4. ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  5. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  6. ^ a b c Demory, Brice-Olivier; Ségransan, Damien; Forveille, Thierry; Queloz, Didier; Beuzit, Jean-Luc; Delfosse, Xavier; Di Folco, Emmanuel; Kervella, Pierre; Le Bouquin, Jean-Baptiste; Perrier, Christian; Benisty, Myriam; Duvert, Gilles; Hofmann, Karl-Heinz; Lopez, Bruno; Petrov, Romain (October 2009). "Mass-radius relation of low and very low-mass stars revisited with the VLTI". Astronomy and Astrophysics. 505 (1): 205–215. arXiv:0906.0602. Bibcode:2009A&A...505..205D. doi:10.1051/0004-6361/200911976. S2CID 14786643.
  7. ^ a b Taylor, B. J. (December 2005), "Statistical Cataloging of Archival Data for Luminosity Class IV-V Stars. III. The Epoch 2004 [Fe/H] and Temperature Catalogs", The Astrophysical Journal Supplement Series, 161 (2): 444–455, Bibcode:2005ApJS..161..444T, doi:10.1086/496885.Vizier catalog entry
  8. ^ a b Wittenmeyer et al. (2006).
  9. ^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008), "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics", The Astrophysical Journal, 687 (2): 1264–1293, arXiv:0807.1686, Bibcode:2008ApJ...687.1264M, doi:10.1086/591785, S2CID 27151456
  10. ^ Garg, Suyog; Karak, Bidya Binay; Egeland, Ricky; Soon, Willie; Baliunas, Sallie (2019), "Waldmeier Effect in Stellar Cycles", The Astrophysical Journal, 886 (2): 132, arXiv:1909.12148, Bibcode:2019ApJ...886..132G, doi:10.3847/1538-4357/ab4a17, S2CID 202888617
  11. ^ "IAU Working Group on Star Names (WGSN)". Retrieved 17 September 2018.
  12. ^ "IAU Catalog of Star Names". International Astronomical Union. Retrieved 2018-09-17.
  13. ^ Irwin et al. (1996).
  14. ^ Bill Steigerwald (2019-03-07). ""Goldilocks" Stars May Be "Just Right" for Finding Habitable Worlds". NASA. Retrieved 2020-05-12. 'I find that certain nearby K stars like 61 Cyg A/B, Epsilon Indi, Groombridge 1618, and HD 156026 may be particularly good targets for future biosignature searches,' said Arney.

Further reading[edit]

  • Irwin, Alan W.; Yang, Stephenson L. S. & Walker, Gordon A. H. (1996), "36 Ophiuchi AB: Incompatibility of the Orbit and Precise Radial Velocities", Publications of the Astronomical Society of the Pacific, 108: 580, Bibcode:1996PASP..108..580I, doi:10.1086/133768
  • Cayrel de Strobel, G.; Lebreton, Y.; Perrin, M.-N. & Cayrel, R. (1989), "A thorough spectroscopic study of the very nearby triple system - 36 Ophiuchi", Astronomy and Astrophysics, 225 (2): 369–380, Bibcode:1989A&A...225..369C
  • Wittenmeyer, R. A.; Endl, Michael; Cochran, William D.; Hatzes, Artie P.; Walker, G. A. H.; Yang, S. L. S. & Paulson, Diane B. (2006), "Detection Limits from the McDonald Observatory Planet Search Program", Astronomical Journal, 132 (1): 177–188, arXiv:astro-ph/0604171, Bibcode:2006AJ....132..177W, doi:10.1086/504942, S2CID 16755455
  • Barnes, Sydney A. (2007), "Ages for Illustrative Field Stars Using Gyrochronology: Viability, Limitations, and Errors", The Astrophysical Journal, 669 (2): 1167–1189, arXiv:0704.3068, Bibcode:2007ApJ...669.1167B, doi:10.1086/519295, S2CID 14614725

External links[edit]

Retrieved from "https://en.wikipedia.org/w/index.php?title=36_Ophiuchi&oldid=1213474126"