134 Tauri


134 Tauri
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 05h 49m 32.92974s[1]
Declination +12° 39′ 04.7582″[1]
Apparent magnitude (V) 4.89[2]
Spectral type B9 IV[3]
B−V color index −0.068±0.004[2]
Radial velocity (Rv)+20.5±0.1[4] km/s
Proper motion (μ) RA: −22.98[1] mas/yr
Dec.: −18.22[1] mas/yr
Parallax (π)13.11 ± 0.33[1] mas
Distance249 ± 6 ly
(76 ± 2 pc)
Absolute magnitude (MV)+0.48[2]
Mass2.99 M
Radius3.3[6] R
[7] L
Surface gravity (log g)4.02±0.14 cgs
Temperature11,150±379 K
Rotational velocity (v sin i)26 km/s
Age248 Myr
Other designations
134 Tau, BD+12° 912, HD 38899, HIP 27511, HR 2010, SAO 94888, WDS J05495+1239A[8]
Database references

134 Tauri is a single[9] star in the zodiac constellation of Taurus. Its apparent magnitude is 4.89,[2] which is bright enough to be faintly visible to the naked eye. The distance to this star, based upon an annual parallax shift of 13.11±0.33 mas,[1] is around 249 light years. The star is moving further from the Sun with a heliocentric radial velocity of +20.5 km/s, having made its closest approach some three million years ago at a distance of 107 ly (32.7 pc).[2]

This is an MK-standard star with a stellar classification of B9 IV,[3] matching a subgiant star that is evolving away from the main sequence having exhausted the hydrogen at its core. It has a low projected rotational velocity[3] of 26 km/s.[5] The star is about 248 million years old with three[5] times the mass of the Sun and approximately 3.3 times the Sun's radius.[6] It is radiating around 78[7] times the Sun's luminosity from its photosphere at an effective temperature of about 11,150 K.[5]


  1. ^ a b c d e f 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. ^ a b c d e Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
  3. ^ a b c Garrison, R. F.; Gray, R. O. (1994), "The late B-type stars: Refined MK classification, confrontation with stromgren photometry, and the effects of rotation", The Astronomical Journal, 107: 1556, Bibcode:1994AJ....107.1556G, doi:10.1086/116967.
  4. ^ De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: A61, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347
  5. ^ a b c d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  6. ^ a b Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  7. ^ a b Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
  8. ^ "134 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-03-28.
  9. ^ Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925–1929, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x, S2CID 119120749.