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{{short description|Binary star system in the constellation Eridanus}}
{{DISPLAYTITLE:Tau<sup>1</sup> Eridani}}
{{For|other star systems with this [[Bayer designation]]|Tau Eridani}}
{{Starbox begin
| name=HRτ<sup>1</sup> 818Eridani
}}
{{Starbox observe
| epoch=2000J2000
| constell=[[Eridanus (constellation)|Eridanus]]
| ra={{RA|02|45|06.18710}}<ref name=aa474_2_653/>
Line 12 ⟶ 13:
}}
{{Starbox character
| class=F7V<ref name="Abt">{{Cite journal | doi = 10.1088/0067-0049/180/1/117| title = MK Classifications of Spectroscopic Binaries| journal = The Astrophysical Journal Supplement Series| volume = 180| issue = 1| pages = 117–118| year = 2009| last1 = Abt | first1 = H. A. | bibcode = 2009ApJS..180..117A| s2cid = 122811461}}</ref>
| b-v=+0.48<ref name="MERMILLIOD"/>
| u-b=+0.00<ref name="MERMILLIOD"/>
Line 51 ⟶ 52:
| metal_fe={{nowrap|−0.08 ± 0.06}}<ref name=aaa420_183/><!-- The Sun's absolute Metallicity is estimated by some to be between logǫFe ≈ 7.5 - 7.7, so the metallicity given of 7.59 for HR 818, in the paper, is nearly the same as the Sun's. The relative to the Sun -0.08 figure is calculated from this paper, by VizieR, see - http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/420/183/table%5b235%5d&HIP=12843 -->
| age_gyr=
| rotation = {{val|3.847|ul=days}}<ref name=rot_rate/>
| rotational_velocity=28.02<ref name=aaa520_A79/>
}}▼
{{Starbox reference▼
| Simbad = Tau1+Eridani▼
| NSTED = <!--Exoplanet Archive name-->
| ARICNS = <!--Code-->
| EPE = <!--Name-->
| KIC = <!--KIC identifier-->
}}
{{Starbox catalog
| names=[[Flamsteed{{odlist designation| F=1]]&nbsp;Eridani,Eri [[Bonner Durchmusterung| BD]]=−19&nbsp;°518, GJ| 111,FK5=2075 [[Henry| DraperGJ=111 Catalogue| HD]]&nbsp;=17206, [[Hipparcos| catalogue|HIP]]&nbsp;=12843, | HR&nbsp;=818, [[Smithsonian| Astrophysical Observatory Star Catalog|SAO]]&nbsp;=11557. }}<ref name=SIMBAD/>
▲}}
▲{{Starbox reference
▲ | Simbad = Tau1tau01+EridaniEri
}}
{{Starbox end}}
'''Tau<sup>1</sup> Eridani''', [[Latinisation of names|Latinized]] from ('''τ<sup>1</sup> Eri''')Eridani, is a [[binary star]]<ref name=pdaov15_121/> system in the [[constellation]] [[Eridanus (constellation)|Eridanus]]. It has an [[apparent magnitude]] of 4.46, making it visible to the naked eye in suitably dark conditions. This a [[spectroscopic binary]] with an orbital period of 958 days.<ref name=pdaov15_121/> It is located about 46&nbsp;[[light year]]s from the Earth.<ref name=aa474_2_653/> At present, the system is moving away from the Sun with a [[radial velocity]] of +26&nbsp;km/s.<ref name=paas21_2_129/> About 305,000 years ago, it made [[perihelion]] passage at an estimated distance of {{Convert|9.35|pc|ly|order=flip|abbr=on}}.<ref name=aa575_A35>{{citation
| last1=Bailer-Jones | first1=C. A. L.
| title=Close encounters of the stellar kind
| last=Reiners | first=A. | journal=Astronomy and& Astrophysics▼
| volume=446575 | issueid=1A35 | pages=267–277 13 | date=January March 20062015▼
| doi=10.1051/0004-6361:20053911/201425221 | bibcode=2006A2015A&A...446575A..267R35B ▼
| postscript=. |arxiv = 1412.3648 | s2cid=59039482
}}</ref>▼
 
Tau<sup>1</sup> Eridani was a latter designation of '''90 Ceti'''.<ref>{{cite journal
| last=Wagman | first=M.
| title=Flamsteed's Missing Stars
| journal=Journal for the History of Astronomy, Vol.|issue=3 | volume=18, NO.| 3/AUG,page=215 P.209,|date=August 1987
| bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305}}</ref>| s2cid=118445625▼
| volume=18 | page=215 |date=August 1987▼
}}</ref>
▲ | bibcode=1987JHA....18..209W | doi=10.1177/002182868701800305}}</ref>
 
== Debris disk ==
Line 82 ⟶ 87:
{{reflist|refs=
 
<ref name=Reiners2006>{{citation | last1=Reiners | first1=Ansgar | title=Rotation- and temperature-dependence of stellar latitudinal differential rotation | journal=Astronomy and Astrophysics | volume=446 | issue=1 |date=January 2006 | pages=267–277 | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R |arxiv = astro-ph/0509399 | s2cid=8642707 }}</ref>
<ref name=Reiners2006>{{citation▼
| title=Rotation- and temperature-dependence of stellar latitudinal differential rotation
▲ | last=Reiners | first=A. | journal=Astronomy and Astrophysics
▲ | volume=446 | issue=1 | pages=267–277 | date=January 2006
▲ | doi=10.1051/0004-6361:20053911 | bibcode=2006A&A...446..267R
| arxiv=astro-ph/0509399 | postscript=. }}</ref>
 
<ref name="SIMBAD">{{citationcite simbad
| title=* tau01 Eri -- Spectroscopic binary
| work=SIMBAD Astronomical Database
| publisher=Centre de Données astronomiques de Strasbourg
| url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Tau1+Eridani
| accessdate=2015-04-15
| postscript=.
Line 107 ⟶ 104:
| doi=10.1051/0004-6361:20078357
| arxiv=0708.1752
| s2cid=18759600
| postscript=.
}}</ref>
Line 120 ⟶ 118:
| volume=420 | pages=183–205 | date=June 2004
| doi=10.1051/0004-6361:20035801 | bibcode=2004A&A...420..183A
| arxiv = astro-ph/0403108 | s2cid=14393039 | postscript=.
}}
[http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-out.add=.&-source=J/A%2bA/420/183/table%5b235%5d&HIP=12843 Vizier catalog entry ]</ref>
Line 136 ⟶ 134:
| volume=21 | issue=2 | pages=129–133
| doi=10.1071/AS04013 | bibcode=2004PASA...21..129N | postscript=.
| doi-access=free}}</ref>
 
<ref name=aaa520_A79>{{citation
| display-authors=1
| last1=Martínez-Arnáiz
| first1=R.
| last2=Maldonado
| first2=J.
| last3=Montes
| first3=D.
| last4=Eiroa
| first4=C.
| last5=Montesinos
| first5=B.
| title=Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter
| journal=Astronomy and Astrophysics
| volume=520
| page=A79
| date=September 2010
| doi=10.1051/0004-6361/200913725
| bibcode=2010A&A...520A..79M
| arxiv=1002.4391
| s2cid=43455849
| postscript=.
| url=http://eprints.ucm.es/37826/1/davidmontes17libre.pdf
▲}}</ref>
| access-date=2018-11-04
| archive-date=2017-09-22
| archive-url=https://web.archive.org/web/20170922031257/http://eprints.ucm.es/37826/1/davidmontes17libre.pdf
| url-status=dead
}}</ref>
 
<ref name="MERMILLIOD">{{citation
| last=Mermilliod | first=J.-C.
| title=Compilation of Eggen's UBV data, transformed to UBV (unpublished)
| journal=Catalogue of Eggen's UBV dataData
| date=1986
| publisher=SIMBAD
Line 184 ⟶ 196:
| volume=144 | issue=1 | id=7 | pages=10 | date=July 2012
| bibcode=2012AJ....144....7T | doi=10.1088/0004-6256/144/1/7
| arxiv=1204.4206 | s2cid=30955275 | postscript=.
}}</ref>
 
Line 199 ⟶ 211:
}}</ref>
 
<ref name="Backman1994">{{Cite journal | doi = 10.1086/117107| title = A reinterpretation of millimeter observations of nearby IRAS excess stars| journal = The Astronomical Journal| volume = 108| pages = 701| year = 1994| last1 = Weintraub | first1 = D. A. | last2 = Stern | first2 = S. A.| display-authors=1 |bibcode = 1994AJ....108..701W | doi-access = free}}</ref>
 
<ref name="Jura2004">{{Cite journal | doi = 10.1086/422975| title = Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars| journal = The Astrophysical Journal Supplement Series| volume = 154| issue = 1| pages = 453–457| year = 2004| last1 = Jura | first1 = M.| last2 = Chen | first2 = C. H.| last3 = Furlan | first3 = E.| last4 = Green | first4 = J.| last5 = Sargent | first5 = B.| last6 = Forrest | first6 = W. J.| last7 = Watson | first7 = D. M.| last8 = Barry | first8 = D. J.| last9 = Hall | first9 = P.| last10 = Herter | first10 = T. L.| last11 = Houck | first11 = J. R.| last12 = Sloan | first12 = G. C.| last13 = Uchida | first13 = K.| last14 = d’Alessio | first14 = P.| last15 = Brandl | first15 = B. R.| last16 = Keller | first16 = L. D.| last17 = Kemper | first17 = F.| last18 = Morris | first18 = P.| last19 = Najita | first19 = J.| last20 = Calvet | first20 = N.| last21 = Hartmann | first21 = L.| last22 = Myers | first22 = P. C.| display-authors=1|arxiv = astro-ph/0405632 |bibcode = 2004ApJS..154..453J | s2cid = 396660}}</ref>▼
 
▲<ref name=Reiners2006rot_rate>{{citation
| display-authors=1
| last1=Hempelmann | first1=A.
| last2=Mittag| first2=M.
| last3=Gonzalez-Perez| first3=J.
| last4=Schmitt| first4=J.
| last5=Schroder| first5=K.
| title=Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability
| journal=Astronomy and Astrophysics
▲ | volume=18586 | page=215A14 | date=AugustFebruary 19872016
| doi=10.1051/0004-6361/201526972| bibcode=2016A&A...586A..14H | doi-access=free
}}</ref>
 
 
▲<ref name="Jura2004">{{Cite journal | doi = 10.1086/422975| title = Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars| journal = The Astrophysical Journal Supplement Series| volume = 154| pages = 453–457| year = 2004| last1 = Jura | first1 = M.| last2 = Chen | first2 = C. H.| last3 = Furlan | first3 = E.| last4 = Green | first4 = J.| last5 = Sargent | first5 = B.| last6 = Forrest | first6 = W. J.| last7 = Watson | first7 = D. M.| last8 = Barry | first8 = D. J.| last9 = Hall | first9 = P.| last10 = Herter | first10 = T. L.| last11 = Houck | first11 = J. R.| last12 = Sloan | first12 = G. C.| last13 = Uchida | first13 = K.| last14 = d’Alessio | first14 = P.| last15 = Brandl | first15 = B. R.| last16 = Keller | first16 = L. D.| last17 = Kemper | first17 = F.| last18 = Morris | first18 = P.| last19 = Najita | first19 = J.| last20 = Calvet | first20 = N.| last21 = Hartmann | first21 = L.| last22 = Myers | first22 = P. C.| display-authors=1|arxiv = astro-ph/0405632 |bibcode = 2004ApJS..154..453J }}</ref>
 
}}
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{{Stars of Eridanus|stat=collapsed}}
 
{{DEFAULTSORT:Tau1 Eridani}}
[[Category:Eridanus (constellation)]]▼
[[Category:F-type main-sequence stars]]
[[Category:Spectroscopic binaries]]
▲[[Category:Eridanus (constellation)]]
[[Category:Bayer objects|Eridani, Tau1]]
[[Category:Gliese and GJDurchmusterung objects|0111]]
[[Category:Binary stars]]
[[Category:Hipparcos objects|012843]]▼
[[Category:Flamsteed objects|Eridani, 01]]
[[Category:HRGliese and GJ objects|08180111]]
[[Category:Henry Draper Catalogue objects|017206]]
▲[[Category:Hipparcos objects|012843]]
 
[[Category:Bright Star Catalogue objects|0818]]
{{main-star-stub}}
{{multi-star-stub}}

Revision as of 11:56, 25 September 2023

For other star systems with this Bayer designation, see Tau Eridani.
τ1 Eridani
Observation data
Epoch J2000      Equinox J2000
Constellation Eridanus
Right ascension 02h 45m 06.18710s[1]
Declination −18° 34′ 21.2149″[1]
Apparent magnitude (V) 4.46[2]
Characteristics
Spectral type F7V[3]
U−B color index +0.00[2]
B−V color index +0.48[2]
Astrometry
Radial velocity (Rv)+25.9[4] km/s
Proper motion (μ) RA: +334.20[1] mas/yr
Dec.: +37.19[1] mas/yr
Parallax (π)70.32 ± 1.83 mas[1]
Distance46 ± 1 ly
(14.2 ± 0.4 pc)
Absolute magnitude (MV)+3.68[5]
Orbit[6]
Period (P)958 d
Eccentricity (e)0.45
Periastron epoch (T)39391.9
Argument of periastron (ω)
(secondary)		180°
Details
Mass1.15[7] M☉
Surface gravity (log g)4.34[8] cgs
Temperature6,231[8] K
Metallicity [Fe/H]−0.08 ± 0.06[8] dex
Rotation3.847 d[9]
Rotational velocity (v sin i)28.02[10] km/s
Other designations
1 Eri, BD−19°518, FK5 2075, GJ 111, HD 17206, HIP 12843, HR 818, SAO 11557[11]
Database references
SIMBADdata

Tau1 Eridani, Latinized from τ1 Eridani, is a binary star[6] system in the constellation Eridanus. It has an apparent magnitude of 4.46, making it visible to the naked eye in suitably dark conditions. This a spectroscopic binary with an orbital period of 958 days.[6] It is located about 46 light years from the Earth.[1] At present, the system is moving away from the Sun with a radial velocity of +26 km/s.[4] About 305,000 years ago, it made perihelion passage at an estimated distance of 30.5 ly (9.35 pc).[12]

Tau1 Eridani was a latter designation of 90 Ceti.[13]

Debris disk

A moderate far-infrared excess was observed for this star system, in the 12μm, 25μm, 60μm and 100μm wavelengths, by the Infrared Astronomical Satellite (IRAS), and published in 1993.[14] This discovery was subsequently interpreted as indicating a debris disk with a radius near to 500 AU. It was further speculated that, if the star system had been observed at longer wavelengths, it was likely the debris disk would have been seen to have a radius considerably wider than 500 AU.[15]

Later observations made by the Spitzer Space Telescope, published in 2004, detected no substantial infrared excess around the stars, within the 14-35μm range of wavelengths.[16]

References

  1. ^ a b c d e f van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. ^ a b c Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  3. ^ Abt, H. A. (2009). "MK Classifications of Spectroscopic Binaries". The Astrophysical Journal Supplement Series. 180 (1): 117–118. Bibcode:2009ApJS..180..117A. doi:10.1088/0067-0049/180/1/117. S2CID 122811461.
  4. ^ a b Nordström, B.; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013.
  5. ^ Reiners, Ansgar (January 2006), "Rotation- and temperature-dependence of stellar latitudinal differential rotation", Astronomy and Astrophysics, 446 (1): 267–277, arXiv:astro-ph/0509399, Bibcode:2006A&A...446..267R, doi:10.1051/0004-6361:20053911, S2CID 8642707
  6. ^ a b c Batten, A. H.; et al. (1978), "Seventh catalogue of the orbital elements of spectroscopic binary systems", Publications of the Dominion Astrophysical Observatory Victoria, 15: 121–295, 150–151, Bibcode:1978PDAO...15..121B.
  7. ^ Tokovinin, Andrei; et al. (July 2012), "Revealing Companions to Nearby Stars with Astrometric Acceleration", The Astronomical Journal, 144 (1): 10, arXiv:1204.4206, Bibcode:2012AJ....144....7T, doi:10.1088/0004-6256/144/1/7, S2CID 30955275, 7.
  8. ^ a b c Allende Prieto, C.; et al. (June 2004), "S4N: A spectroscopic survey of stars in the solar neighborhood. The Nearest 15 pc", Astronomy and Astrophysics, 420: 183–205, arXiv:astro-ph/0403108, Bibcode:2004A&A...420..183A, doi:10.1051/0004-6361:20035801, S2CID 14393039. Vizier catalog entry
  9. ^ Hempelmann, A.; et al. (February 2016), "Measuring rotation periods of solar-like stars using TIGRE. A study of periodic CaII H+K S-index variability", Astronomy and Astrophysics, 586: A14, Bibcode:2016A&A...586A..14H, doi:10.1051/0004-6361/201526972
  10. ^ Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF), Astronomy and Astrophysics, 520: A79, arXiv:1002.4391, Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID 43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04.
  11. ^ "* tau01 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2015-04-15.{{cite web}}: CS1 maint: postscript (link)
  12. ^ Bailer-Jones, C. A. L. (March 2015), "Close encounters of the stellar kind", Astronomy & Astrophysics, 575: 13, arXiv:1412.3648, Bibcode:2015A&A...575A..35B, doi:10.1051/0004-6361/201425221, S2CID 59039482, A35.
  13. ^ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 215. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
  14. ^ Backman, Dana E; et al. (1993), "Main-sequence stars with circumstellar solid material - The VEGA phenomenon", Protostars and planets III (A93-42937 17-90): 1253–1304, Bibcode:1993prpl.conf.1253B.
  15. ^ Weintraub, D. A.; et al. (1994). "A reinterpretation of millimeter observations of nearby IRAS excess stars". The Astronomical Journal. 108: 701. Bibcode:1994AJ....108..701W. doi:10.1086/117107.
  16. ^ Jura, M.; et al. (2004). "Mid‐Infrared Spectra of Dust Debris around Main‐Sequence Stars". The Astrophysical Journal Supplement Series. 154 (1): 453–457. arXiv:astro-ph/0405632. Bibcode:2004ApJS..154..453J. doi:10.1086/422975. S2CID 396660.
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