90 Tauri

90 Tauri (90 Tau) is a star in the zodiac constellation of Taurus,[9] located 144 light years away from the Sun.[1] It is visible to the naked eye as a faint, white-hued star with an apparent visual magnitude of 4.27.[2] 90 Tauri is a member of the Hyades cluster and is listed as a double star.

90 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 38m 09.46166s[1]
Declination +12° 30′ 38.9918″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Spectral type A6 V[3]
U−B color index +0.11[4]
B−V color index +0.12[4]
Astrometry
Radial velocity (Rv)40.30±1[5] km/s
Proper motion (μ) RA: 102.40[6] mas/yr
Dec.: −15.78[6] mas/yr
Parallax (π)22.6374 ± 0.3453[1] mas
Distance144 ± 2 ly
(44.2 ± 0.7 pc)
Absolute magnitude (MV)+1.18[7]
Details
Mass2.09±0.11[8] M☉
Radius2.8[8] R☉
Surface gravity (log g)3.88±0.10[8] cgs
Temperature8,130[8] K
Rotational velocity (v sin i)89[3] km/s
Other designations
c Tau, 90 Tau, BD+12°618, FK5 2342, HD 29388, HIP 21589, HR 1473, SAO 94044[9]
Database references
SIMBADdata

This is an A-type main-sequence star with a stellar classification of A6 V.[3] It has 2.1 times the mass of the Sun and 2.8 times the Sun's radius.[8] An orbiting companion was announced in 2014. This is probably a spectral class K4V star with an estimated orbital period of at least 84 days. The primary is being orbited by a debris disk.[10]

References
  1. 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.
  2. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. Royer, F.; Zorec, J.; Gómez, A. E. (2007). "Rotational velocities of A-type stars". Astronomy and Astrophysics. 463 (2): 671. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. S2CID 18475298.
  4. Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  6. van Leeuwen, F.; et al. (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.
  7. Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
  8. Allende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: masses, radii and effective temperatures". Astronomy and Astrophysics. 352: 555–562. arXiv:astro-ph/9911002. Bibcode:1999A&A...352..555A.
  9. "90 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-29.
  10. Marion, L.; et al. (October 2014), "Searching for faint companions with VLTI/PIONIER. II. 92 main sequence stars from the Exozodi survey", Astronomy & Astrophysics, 570: 12, arXiv:1409.6105, Bibcode:2014A&A...570A.127M, doi:10.1051/0004-6361/201424780, S2CID 8756486, A127.
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