| 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] |
| Distance | approx. 1,700
ly (approx. 530 pc) |
| Absolute magnitude (MV) | −3.74 [2] |
| Details | |
| Mass | 15.6±0.8 [4] M☉ |
| Luminosity | 6,833.12 [2] L☉ |
| Rotational velocity (v sin i) | 169 [6] km/s |
| Age | 10.0±0.1 [4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- ^ a b c d e f 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
- ^ a b c d e f g h 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.
- ^ a b c d e 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
- ^ a b c d e 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.
- ^ a b 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.
- ^ a b 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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Star clusters |
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| Galaxies |
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| 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] |
| Distance | approx. 1,700
ly (approx. 530 pc) |
| Absolute magnitude (MV) | −3.74 [2] |
| Details | |
| Mass | 15.6±0.8 [4] M☉ |
| Luminosity | 6,833.12 [2] L☉ |
| Rotational velocity (v sin i) | 169 [6] km/s |
| Age | 10.0±0.1 [4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
References
- ^ a b c d e f 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
- ^ a b c d e f g h 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.
- ^ a b c d e 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
- ^ a b c d e 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.
- ^ a b 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.
- ^ a b 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.
| Stars |
| ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
|
Star clusters |
| ||||||||||
| Nebulae |
| ||||||||||
| Galaxies |
| ||||||||||
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