HD 70930

HD 70930 is a binary star[8] system in the southern constellation of Vela. It has the Bayer designation B Velorum, while HD 70930 is the star's identifier in the Henry Draper catalogue. With a combined apparent visual magnitude of 4.79,[2] it is visible to the naked eye as a faint point of light. The distance to this system is approximately 1,700 light years based on parallax,[1] and it has an absolute magnitude of −3.74.[2] It is drifting further away from the Sun with a radial velocity of about +27 km/s.[2] The system is a member of the Vel OB2 association of co-moving stars.[9]

This article is about B Velorum. For b Velorum, see HD 74180.
HD 70930
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 08h 22m 31.6941s[1]
Declination −48° 29′ 25.3631″[1]
Apparent magnitude (V) 4.79[2] (5.14 + 6.08)[3]
Characteristics
Spectral type B1V[4] or B2III[5]
B−V color index −0.146±0.002[2]
Astrometry
Radial velocity (Rv)+27.0±4.5[2] km/s
Proper motion (μ) RA: −5.10±0.39[1] mas/yr
Dec.: +7.76±0.33[1] mas/yr
Parallax (π)1.90 ± 0.32[1] mas
Distanceapprox. 1,700 ly
(approx. 530 pc)
Absolute magnitude (MV)−3.74[2]
Details
Mass15.6±0.8[4] M☉
Luminosity6,833.12[2] L☉
Rotational velocity (v sin i)169[6] km/s
Age10.0±0.1[4] Myr
Other designations
I 67[3], B Velorum, CD−48°3734, HD 70930, HIP 41039, HR 3294, SAO 219848, CCDM 08225-4829, WDS J08225-4829AB[7]
Database references
SIMBADdata

The double nature of this system was discovered in 1896 by Scottish astronomer Robert T. A. Innes[3] – it is now known to be a double-lined spectroscopic binary.[10] The magnitude 5.14[3] primary component has a blue-white hue and has been assigned stellar classifications of B1V[4] and B2III,[5] matching a B-type main-sequence star or a giant star, respectively. It is a massive object – over 15 times the mass of the Sun – and is around 10 million years old.[4] The star has a high rate of spin, showing a projected rotational velocity of 169 km/s.[6] Its companion, at magnitude +6.08, is located at an angular separation of 0.8″ along a position angle of 139°, as of 2008.[3]

References
  1. 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. Vizier catalog entry
  2. 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.
  3. Mason, B. D.; et al. (2014), The Washington Visual Double Star Catalog, Bibcode:2001AJ....122.3466M, doi:10.1086/323920
  4. 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, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  5. Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  6. Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  7. "HD 70930". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-06.
  8. 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  9. de Zeeuw, P. T.; et al. (January 1999), "A HIPPARCOS Census of the Nearby OB Associations", The Astronomical Journal, 117 (1): 354–399, arXiv:astro-ph/9809227, Bibcode:1999AJ....117..354D, doi:10.1086/300682.
  10. 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.
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