36 Ophiuchi: Difference between revisions
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<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> |
<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> |
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<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=. }}[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> |
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<ref name="search">Wittenmeyer ''et al.'' (2006).</ref> |
<ref name="search">Wittenmeyer ''et al.'' (2006).</ref> |
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==Further reading== |
==Further reading== |
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*{{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 |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|doi-access=free }} |
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*{{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 |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 }} |
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*{{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 |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 }} |
Revision as of 11:05, 22 June 2020
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[1] |
Declination | A: −26° 36′ 09.04″ B: −26° 36′ 10.18″ C: −26° 32′ 46.129″[1] |
Apparent magnitude (V) | 5.08/5.08/6.34[1] |
Characteristics | |
Spectral type | K2 V/K1 V/K5 V[1] |
U−B color index | 0.51(AB)/1.04 |
B−V color index | 0.86(AB)/1.15 |
Variable type | C: RS CV |
Astrometry | |
Radial velocity (Rv) | -0.6/0.0/-1.6[1] km/s |
Proper motion (μ) | RA: -488.2/-473/-480.06[1] mas/yr Dec.: -1156.0/-1143/-1123.48[1] mas/yr |
Parallax (π) | 167.1 ± 1.1 mas[1] |
Distance | 19.5 ± 0.1 ly (5.98 ± 0.04 pc) |
Orbit | |
Companion | 36 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) | 1763.39 |
Details | |
36 Oph A/B | |
Mass | 0.85/0.85 M☉ |
Radius | 0.817 ± 0.016[2]/0.81 R☉ |
Luminosity (bolometric) | 0.33/0.36[note 1] L☉ |
Luminosity (visual, LV) | 0.28/0.27 L☉ |
Temperature | 4,843 ± 134[2]/4,985 ± 20[3] K |
Metallicity | B: –0.31 ± 0.042[3] dex |
Metallicity [Fe/H] | A: –0.20[2] dex |
Age | 0.6-1.8[4][5] Gyr |
36 Oph C | |
Mass | 0.71 M☉ |
Radius | 0.72 R☉ |
Luminosity (bolometric) | 0.20[note 1] L☉ |
Luminosity (visual, LV) | 0.09 L☉ |
Temperature | 4,550 K |
Metallicity | 46-100% Sun |
Other designations | |
Database references | |
SIMBAD | AB |
A | |
B | |
C | |
Exoplanet Archive | A |
B | |
C | |
ARICNS | A |
B | |
C |
36 Ophiuchi, formally named Guniibuu /ɡəˈniːbuː/, is a triple star system 19.5 light years 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.
Star C is separated from the A-B pair by 700 arc seconds, 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 chromospheres.
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 Working Group on Star Names (WGSN)[6] 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.[7]
Hunt for substellar objects
The McDonald Observatory team has set limits to the presence of one or more planets[4] 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 AU orbits are inherently unstable around either 36 Ophiuchi A or 36 Ophiuchi B.[8]
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.[9]
See also
Notes
- ^ 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
- ^ a b c d e f g h "SIMBAD Astronomical Database". Centre de Données astronomiques de Strasbourg. Retrieved 2013-08-23.
- ^ a b c Demory, B.-O.; et al. (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
- ^ 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
- ^ a b Wittenmeyer et al. (2006).
- ^ 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
- ^ "IAU Working Group on Star Names (WGSN)". Retrieved 17 September 2018.
- ^ "IAU Catalog of Star Names". International Astronomical Union. Retrieved 2018-09-17.
- ^ Irwin et al. (1996).
- ^
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.
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Further reading
- 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
{{citation}}
: Unknown parameter|lastauthoramp=
ignored (|name-list-style=
suggested) (help) - 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
{{citation}}
: Unknown parameter|lastauthoramp=
ignored (|name-list-style=
suggested) (help) - 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
{{citation}}
: Unknown parameter|lastauthoramp=
ignored (|name-list-style=
suggested) (help) - 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
External links
- "36 Ophiuchi". SolStation. Retrieved 3 November 2005.
- https://arxiv.org/abs/astro-ph/0604171