72 Tauri
Location of 72 Tauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Taurus
Right ascension 04h 27m 17.4508s[1]
Declination +22° 59′ 46.778″[1]
Apparent magnitude (V) 5.514[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type B7V[3]
U−B color index −0.48[4]
B−V color index −0.10[4]
Astrometry
Radial velocity (Rv)32.2±1.1[5] km/s
Proper motion (μ) RA: −1.409[1] mas/yr
Dec.: −13.722[1] mas/yr
Parallax (π)7.9390 ± 0.398 mas[1]
Distance410 ± 20 ly
(126 ± 6 pc)
Absolute magnitude (MV)+0.21[6]
Details
Mass3.47[1] M☉
Radius2.8[1] R☉
Luminosity185[1] L☉
Surface gravity (log g)3.97[1] cgs
Temperature12,689[1] K
Rotational velocity (v sin i)115[7] km/s
Age38[8] Myr
Other designations
υ2 Tau, 72 Tauri, BD+22°699, HD 28149, HIP 20789, HR 1399[9][10]
Database references
SIMBADdata

72 Tauri (abbreviated 72 Tau) is a possible binary star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of +5.5, although only 0.29° from the brighter υ Tauri. Based upon an annual parallax shift of 7.9 mas seen from Earth, it is around 410 light years from the Sun.

Properties

72 Tauri is a B-type main sequence star with a stellar classification of B7V.[3] With a mass of 3.48 M☉ and an estimated age of 38 million years,[8] it is 2.8 times the size of the Sun and 185 times its luminosity.[1]

Occasionally this star system is given the Bayer designation υ2 Tauri with υ Tauri, which is separated from it by 0.29° in the sky.[4] υ Tauri is a foreground star, the two are unrelated,[11] and although 72 Tauri lies near the Hyades open cluster, it is much further away.[1]

72 Tauri lies near the ecliptic and can be occulted by the moon. Observations of an occultation in 1985 showed that it was a binary star with the two components separated by 0.1″.[12] There has been no confirmation of this finding and other sources list the star as single.[13]

References

  1. ^ a b c d e f g h i j k l m Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. ^ a b Mooley, Kunal; et al. (July 2013). "B- and A-type Stars in the Taurus-Auriga Star-forming Region". The Astrophysical Journal. 771 (2): 24. arXiv:1306.0598. Bibcode:2013ApJ...771..110M. doi:10.1088/0004-637X/771/2/110. S2CID 2176170. 110.
  4. ^ a b c Hoffleit, D.; Jaschek, C. (1991). The Bright Star Catalogue. New Haven: Yale University Observatory. Bibcode:1991bsc..book.....H.
  5. ^ Gontcharov, G. A. (November 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. ISSN 1063-7737. S2CID 119231169.
  6. ^ 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.
  7. ^ Freire Ferrero, R.; et al. (February 2012). "High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database". The Astronomical Journal. 143 (2): 38. Bibcode:2012AJ....143...28F. doi:10.1088/0004-6256/143/2/28. 28.
  8. ^ a b Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (25 July 2016). "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars". The Astronomical Journal. 152 (2): 40. arXiv:1604.06456. Bibcode:2016AJ....152...40G. doi:10.3847/0004-6256/152/2/40. eISSN 1538-3881.
  9. ^ "72 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-05.
  10. ^ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002). 4027. Bibcode:2004yCat.4027....0K.
  11. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  12. ^ Qian, B. -C; Zhu, G. -L.; Fan, Q. -Y. (1987). "The measurements of stellar angular diameter by photoelectric observation of lunar occultation". Acta Astronomica Sinica. 28: 45. Bibcode:1987AcASn..28...39Q.
  13. ^ 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.
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