Astronomy:90 Tauri

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Short description: A-type main-sequence star in the constellation Taurus
90 Tauri
Location of 90 Tauri (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  04h 38m 09.46166s[1]
Declination +12° 30′ 38.9918″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A6 V[4]
U−B color index +0.11[5]
B−V color index +0.12[5]
Astrometry
Radial velocity (Rv)40.30±1[6] km/s
Proper motion (μ) RA: 102.40[7] mas/yr
Dec.: −15.78[7] mas/yr
Parallax (π)22.6374 ± 0.3453[1] mas
Distance144 ± 2 ly
(44.2 ± 0.7 pc)
Absolute magnitude (MV)+1.18[8]
Details
Mass2.09±0.11[9] M☉
Radius2.8[9] R☉
Surface gravity (log g)3.88±0.10[9] cgs
Temperature8,130[9] K
Rotational velocity (v sin i)89[4] km/s
Other designations
c Tau, 90 Tau, BD+12°618, FK5 2342, HD 29388, HIP 21589, HR 1473, SAO 94044[10]
Database references
SIMBADdata

90 Tauri (90 Tau) is a star in the zodiac constellation of Taurus,[10] 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.

This is an A-type main-sequence star with a stellar classification of A6 V.[4] It has 2.1 times the mass of the Sun and 2.8 times the Sun's radius.[9] 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.[11]

References

  1. ↑ 1.0 1.1 1.2 1.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 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. ↑ Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 4.2 Royer, F.; Zorec, J.; Gómez, A. E. (2007). "Rotational velocities of A-type stars". Astronomy and Astrophysics 463 (2): 671. doi:10.1051/0004-6361:20065224. Bibcode: 2007A&A...463..671R. 
  5. ↑ 5.0 5.1 Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode: 1986EgUBV........0M. 
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  8. ↑ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal 116 (1): 284–292, doi:10.1086/300413, Bibcode: 1998AJ....116..284E. 
  9. ↑ 9.0 9.1 9.2 9.3 9.4 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. Bibcode: 1999A&A...352..555A. 
  10. ↑ 10.0 10.1 "90 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=90+Tau. 
  11. ↑ 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, doi:10.1051/0004-6361/201424780, A127, Bibcode: 2014A&A...570A.127M. 



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