Binary star system in the constellation Vela
This article is about B Velorum. For b Velorum, see HD 74180 .
HD 70930
Observation dataEpoch J2000 Equinox J2000
Constellation
Vela
Right ascension
08 22 31.6941
Declination
−48° 29′ 25.3631″
Apparent magnitude (V)
4.79 (5.14 + 6.08)
Characteristics
Spectral type
B1V or B2III
B−V color index
−0.146±0.002
Astrometry Radial velocity (Rv )+27.0±4.5 km/s Proper motion (μ) RA: −5.10±0.39 mas /yr Dec.: +7.76±0.33 mas /yr Parallax (π)1.90 ± 0.32 mas Distance approx. 1,700 ly pc ) Absolute magnitude (MV )−3.74 Details Mass 15.6±0.8 M ☉ Luminosity 6,833.12 L ☉ Rotational velocity (v sin i )169 km/s Age 10.0±0.1 Myr Other designations I 67, B Velorum , CD −48°3734, HD 70930, HIP 41039, HR 3294, SAO 219848, CCDM 08225-4829, WDS J08225-4829AB Database references SIMBAD data
HD 70930 is a binary star 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 apparent visual magnitude of 4.79, 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 , and it has an absolute magnitude of −3.74. It is drifting further away from the Sun with a radial velocity of about +27 km/s. The system is a member of the Vel OB2 association of co-moving stars.
The double nature of this system was discovered in 1896 by Scottish astronomer Robert T. A. Innes – it is now known to be a double-lined spectroscopic binary . The magnitude 5.14 primary component has a blue-white hue and has been assigned stellar classifications of B1V and B2III, 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. The star has a high rate of spin, showing a projected rotational velocity of 169 km/s. Its companion, at magnitude +6.08, is located at an angular separation of 0.8″ along a position angle of 139°, as of 2008.
References
^ 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
^ 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 .
^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal , 122 (6): 3466, Bibcode :2001AJ....122.3466M , doi :10.1086/323920
^ 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 , S2CID 118629873 .
^ Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H .
^ 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 .
"HD 70930" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-10-06.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 . S2CID 14878976 .
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 , S2CID 16098861 .
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 .
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