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HD 70930

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 mas[1]
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

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]

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]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference uesugi_fukuda70 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference deZeeuw1999 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference chini2012 was invoked but never defined (see the help page).
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