Tau Tauri

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τ Tauri
Taurus constellation map.svg
Red circle.svg

Location of τ Tauri (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Taurus
Right ascension 04h 42m 14.70161s[1]
Declination 22° 57′ 24.9214″[1]
Apparent magnitude (V) 4.27[2]
Spectral type B3V[3]
U−B color index -0.57[4]
B−V color index -0.14[4]
Radial velocity (Rv) +14.60[5] km/s
Proper motion (μ) RA: -2.89[1] mas/yr
Dec.: -21.86[1] mas/yr
Parallax (π) 8.19 ± 0.88[1] mas
Distance approx. 400 ly
(approx. 120 pc)
Absolute magnitude (MV) -1.15[2]
Mass 6.4[6] M
Luminosity 1,472[7] L
Surface gravity (log g) 2.60[8] cgs
Temperature 18,700[7] K
Metallicity [Fe/H] -0.51[8] dex
Rotational velocity (v sin i) 115[9] km/s
Other designations
94 Tauri, BD+22°739, CCDM J04422+2257AB, FK5 174, GC 5716, GSC 01830-02129, HIP 21881, HR 1497, HD 29763, SAO 76721, WDS J04422+2257A
Database references

Tau Tauri (τ Tau) is a quadruple star system[10] in the constellation Taurus. The primary, Aa, is a class B3V[3] (blue main-sequence) star. Its apparent magnitude is 4.33[11] and it is approximately 400 light years away from Earth based on parallax.[1]

The primary is a spectroscopic binary with a period of 2.96 days and eccentricity 0.05; it also has a close companion, Ab, with magnitude 6.97 and separation 0.2" in a 58-year orbit.[12][10] The more distant component B is a type A1V star with magnitude 7.2 and separation 62.8".[10]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. arXiv:0708.1752Freely accessible. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. Bibcode:2012AstL...38..331A. arXiv:1108.4971Freely accessible. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H. 
  4. ^ a b Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  5. ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336. 
  6. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. arXiv:1007.4883Freely accessible. doi:10.1111/j.1365-2966.2010.17434.x.  Vizier catalog entry
  7. ^ a b Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. Bibcode:2010AN....331..349H. arXiv:1003.2335Freely accessible. doi:10.1002/asna.200911355.  Vizier catalog entry
  8. ^ a b Wu, Yue; Singh, H. P.; Prugniel, P.; Gupta, R.; Koleva, M. (2010). "Coudé-feed stellar spectral library – atmospheric parameters". Astronomy & Astrophysics. 525: A71. Bibcode:2011A&A...525A..71W. arXiv:1009.1491Freely accessible. doi:10.1051/0004-6361/201015014. 
  9. ^ Abt, Helmut A.; Levato, Hugo; Grosso, Monica (2002). "Rotational Velocities of B Stars". The Astrophysical Journal. 573: 359. Bibcode:2002ApJ...573..359A. doi:10.1086/340590. 
  10. ^ a b c Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. Bibcode:2008MNRAS.389..869E. arXiv:0806.2878Freely accessible. doi:10.1111/j.1365-2966.2008.13596.x.  Vizier catalog entry
  11. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry
  12. ^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries". Astronomy & Astrophysics. 546: A69. Bibcode:2012A&A...546A..69M. doi:10.1051/0004-6361/201219774.  Vizier catalog entry