Astronomy:GX Velorum
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 11m 04.39802s[1] |
| Declination | −44° 52′ 04.4411″[1] |
| Apparent magnitude (V) | +4.99[2] (4.97 to 5.04)[3] |
| Characteristics | |
| Spectral type | B5 Ia[4] |
| U−B color index | −0.57[5] |
| B−V color index | +0.22[5] |
| Variable type | α Cyg?[3] |
| Astrometry | |
| Radial velocity (Rv) | +28.2±0.8[6] km/s |
| Proper motion (μ) | RA: −5.608[1] mas/yr Dec.: +3.843[1] mas/yr |
| Parallax (π) | 0.7696 ± 0.1585[1] mas |
| Distance | approx. 4,200 ly (approx. 1,300 pc) |
| Absolute magnitude (MV) | −7.20[7] |
| Details[8] | |
| Mass | 35 M☉ |
| Radius | 61±7[9] R☉ |
| Luminosity | 214,000[9] L☉ |
| Surface gravity (log g) | 2.12±0.05[9] cgs |
| Temperature | 15,000±150[9] K |
| Rotational velocity (v sin i) | 39 km/s |
| Age | 8.3[10] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
GX Velorum is a solitary[12] variable star[3] in the southern constellation of Vela. It is visible to the naked eye as a faint, blue-white hued star with an apparent visual magnitude that fluctuates around 4.99.[2] Based upon parallax measurements, it is located approximately 4,200 light years distant from the Sun, and is drifting further away with a radial velocity of +28 km/s.[6] It may be a member of the Vela OB1 association of co-moving stars.[7]
This object is a massive blue supergiant with a stellar classification of B5 Ia.[4] It is suspected to be an Alpha Cygni-type pulsating variable and ranges in brightness from 4.97 down to 5.04 magnitude.[3] It is losing mass at the rate of (0.40±0.02)×10−6 M☉ yr−1,[9] or one solar mass every 2.5 million years. The star is 8.3[10] million years old with 35 times the mass of the Sun.[8] It has expanded to around 61[9] times the Sun's radius and is radiating 214,000[9] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 15,000 K.[9]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 3.2 3.3 Samus', N. N et al. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S.
- ↑ 4.0 4.1 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.
- ↑ 5.0 5.1 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 6.0 6.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G.
- ↑ 7.0 7.1 Reed, B. Cameron (2000). "Vela OB1: Probable New Members and Hertzsprung-Russell Diagram". The Astronomical Journal 119 (4): 1855–1859. doi:10.1086/301313. Bibcode: 2000AJ....119.1855R.
- ↑ 8.0 8.1 Fraser, M. et al. (2010). "Atmospheric parameters and rotational velocities for a sample of Galactic B-type supergiants". Monthly Notices of the Royal Astronomical Society 404 (3): 1306. doi:10.1111/j.1365-2966.2010.16392.x. Bibcode: 2010MNRAS.404.1306F.
- ↑ 9.0 9.1 9.2 9.3 9.4 9.5 9.6 9.7 Haucke, M. et al. (June 2018), "Wind properties of variable B supergiants. Evidence of pulsations connected with mass-loss episodes", Astronomy & Astrophysics 614: 28, doi:10.1051/0004-6361/201731678, A91, Bibcode: 2018A&A...614A..91H
- ↑ 10.0 10.1 Tetzlaff, N. et al. (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.
- ↑ "GX Vel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GX+Vel.
- ↑ 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.
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
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