Astronomy:139 Tauri

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Short description: Star in the constellation Taurus
139 Tauri
Observation data
Equinox J2000.0]] (ICRS)
Constellation Taurus
Right ascension  05h 57m 59.65632s[1]
Declination +25° 57′ 14.0799″[1]
Apparent magnitude (V) 4.81[2]
Characteristics
Spectral type B1 Ib[3][4] or B0.5 II[5]
B−V color index −0.088±0.003[2]
Astrometry
Radial velocity (Rv)+8.0±4.2[6] km/s
Proper motion (μ) RA: −2.06[1] mas/yr
Dec.: −1.95[1] mas/yr
Parallax (π)2.10 ± 0.19[1] mas
Distance1,600 ± 100 ly
(480 ± 40 pc)
Absolute magnitude (MV)−4.4[7]
Details
Mass10.1±1.0[3] M☉
Radius20.7[8] R☉
Luminosity81,000[8] L☉
Surface gravity (log g)3.559±0.059[5] cgs
Temperature24,660±1,620[4] K
Rotational velocity (v sin i)140[9] km/s
Age22.5±2.6[3] Myr
Other designations
139 Tau, BD+25° 1052, HD 40111, HIP 28237, HR 2084, SAO 77775[10]
Database references
SIMBADdata

139 Tauri is a single,[11] blue-white hued star in the zodiac constellation of Taurus. It is faintly visible to the naked eye with an apparent visual magnitude of 4.81.[2] The distance to this star, as determined from an annual parallax shift of 2.10±0.19 mas,[1] is roughly 1,600 light years. Because this star is located near the ecliptic, it is subject to occultations by the Moon. One such event was observed April 28, 1990.[12]

This is a massive B-type lower-luminosity supergiant or bright giant star with a stellar classification of B1 Ib[3][4] or B0.5 II,[5] respectively. It is around 22.5[3] million years old with a high rate of spin, showing a projected rotational velocity of 140 km/s.[9] J. D. Rosendhal (1973) identified weak emission features associated with an asymmetric H-alpha absorption line, providing evidence of mass loss.[13] The star has about 10[3] times the mass of the Sun and around 20[8] times the Sun's radius. It is radiating over 80,000[8] times the Sun's luminosity from its photosphere at an effective temperature of around 24,660 K.[4] Stars such as this with 10 or more solar masses are expected to end their life by exploding as a Type II supernova.[14]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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. 
  2. ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Tetzlaff, N. et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190–200, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  4. ↑ 4.0 4.1 4.2 4.3 Zorec, J. et al. (2009), "Fundamental parameters of B supergiants from the BCD system. I. Calibration of the (λ1, D) parameters into Teff", Astronomy and Astrophysics 501 (1): 297–320, doi:10.1051/0004-6361/200811147, Bibcode: 2009A&A...501..297Z 
  5. ↑ 5.0 5.1 5.2 Huang, W.; Gies, D. R. (August 2008), "Stellar Rotation in Field and Cluster B Stars", The Astrophysical Journal 683 (2): 1045–1051, doi:10.1086/590106, Bibcode: 2008ApJ...683.1045H. 
  6. ↑ De Bruijne, J. H. J.; Eilers, A.-C. (2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics 546: A61, doi:10.1051/0004-6361/201219219, Bibcode: 2012A&A...546A..61D. 
  7. ↑ Wegner, W (2003). "The total-to-selective extinction ratio determined from near IR photometry of OB stars". Astronomische Nachrichten 324 (3): 219–237. doi:10.1002/asna.200310081. Bibcode: 2003AN....324..219W. 
  8. ↑ 8.0 8.1 8.2 8.3 Lamers, H. J. G. L. M (1981). "Mass loss from O and B stars". The Astrophysical Journal 245: 593. doi:10.1086/158835. Bibcode: 1981ApJ...245..593L. 
  9. ↑ 9.0 9.1 Simón-Díaz, S.; Herrero, A. (2014), "The IACOB project. I. Rotational velocities in northern Galactic O- and early B-type stars revisited. The impact of other sources of line-broadening", Astronomy & Astrophysics 562: A135, doi:10.1051/0004-6361/201322758, Bibcode: 2014A&A...562A.135S. 
  10. ↑ "139 Tau". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=139+Tau. 
  11. ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  12. ↑ Meyer, C. et al. (1995), "Observations of lunar occultations at Observatoire de la Cote d'Azur", Astronomy and Astrophysics Supplement 110: 107, Bibcode: 1995A&AS..110..107M. 
  13. ↑ Rosendhal, J. D. (December 1973), "A survey of H-alpha emission in early-type high-luminosity stars", Astrophysical Journal 186: 909, doi:10.1086/152555, Bibcode: 1973ApJ...186..909R. 
  14. ↑ Reed, B. Cameron (June 28, 2005), "New Estimates of the Solar-Neighborhood Massive-Stars Birthrate and the Galactic Supernova Rate", The Astronomical Journal 130 (4): 1652–1657, doi:10.1086/444474, Bibcode: 2005AJ....130.1652R. 



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