Tau6 Eridani

Tau6 Eridani, Latinized from τ6 Eridani, is a single[9] star in the equatorial constellation of Eridanus, located near the constellation border with Fornax. It has a yellow-white hue with an apparent visual magnitude of 4.22,[2] which is bright enough to be seen with the naked eye. Based upon parallax measurements, the distance to this star is around 57.5 light years.[1] It is drifting further away with a radial velocity of +8 km/s.[4]

For other star systems with this Bayer designation, see Tau Eridani.
τ6 Eridani
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Eridanus
Right ascension 03h 46m 50.88819s[1]
Declination −23° 14′ 59.0046″[1]
Apparent magnitude (V) 4.22[2]
Characteristics
Spectral type F5IV-V[3]
U−B color index −0.03[2]
B−V color index +0.43[2]
Astrometry
Radial velocity (Rv)8.0±0.8[4] km/s
Proper motion (μ) RA: −158.84[1] mas/yr
Dec.: −528.95[1] mas/yr
Parallax (π)56.73 ± 0.19 mas[1]
Distance57.5 ± 0.2 ly
(17.63 ± 0.06 pc)
Absolute magnitude (MV)2.98[5]
Details
Mass1.35[4] M☉
Radius1.80+0.08
−0.03[6] R☉
Luminosity5.47±0.06[6] L☉
Surface gravity (log g)4.21±0.13[4] cgs
Temperature6,584+47
−144[6] K
Metallicity [Fe/H]−0.03±0.11[4] dex
Rotational velocity (v sin i)16.25[7] km/s
Age2.0[4] Gyr
Other designations
τ6 Eri, 27 Eridani, CD−23°1565, FK5 140, GC 168827, HD 23754, HIP 17651, HR 1173, SAO 101600[8]
Database references
SIMBADdata

The spectrum of Tau6 Eridani matches a stellar classification of F5IV-V,[3] indicating it is an F-type star that shows traits of both a main sequence star and a subgiant. It has an estimated 135%[4] of the Sun's mass and about 1.8 time the radius of the Sun.[6] The star is radiating 5.5[6] times the luminosity of the Sun at an effective temperature of 6,508 K,[4] and it does not display any surface magnetic activity.[7] The star has been examined for infrared excess emission that could indicate the presence of circumstellar matter, but none has been detected.[10]

References
  1. van Leeuwen, F. (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. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.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. Gray, R. O.; et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–170, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  4. Kordopatis, G.; Gilmore, G.; Steinmetz, M.; Boeche, C.; Seabroke, G. M.; Siebert, A.; Zwitter, T.; Binney, J.; et al. (November 2013), "The Radial Velocity Experiment (RAVE): Fourth Data Release", The Astronomical Journal, 146 (5): 36, arXiv:1309.4284, Bibcode:2013AJ....146..134K, doi:10.1088/0004-6256/146/5/134, S2CID 119221010, 134.
  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. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  7. 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.
  8. "* tau06 Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-13.
  9. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  10. Weinberger, Alycia J.; Bryden, Geoff; Kennedy, Grant M.; Roberge, Aki; Defrère, Denis; Hinz, Philip M.; Millan-Gabet, Rafael; Rieke, George; et al. (February 2015), "Target Selection for the LBTI Exozodi Key Science Program", The Astrophysical Journal Supplement Series, 216 (2): 8, arXiv:1501.01319, Bibcode:2015ApJS..216...24W, doi:10.1088/0067-0049/216/2/24, S2CID 38713562, 24.
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