Misplaced Pages

GX Velorum

Article snapshot taken from[REDACTED] with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Star in the constellation Vela
GX Velorum
Location of GX Velorum (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vela
Right ascension 09 11 04.39802
Declination −44° 52′ 04.4411″
Apparent magnitude (V) +4.99 (4.97 to 5.04)
Characteristics
Spectral type B5 Ia
U−B color index −0.57
B−V color index +0.22
Variable type α Cyg?
Astrometry
Radial velocity (Rv)+28.2±0.8 km/s
Proper motion (μ) RA: −5.608 mas/yr
Dec.: +3.843 mas/yr
Parallax (π)0.7696 ± 0.1585 mas
Distanceapprox. 4,200 ly
(approx. 1,300 pc)
Absolute magnitude (MV)−7.20
Details
Mass35 M☉
Radius61±7 R☉
Luminosity214,000 L☉
Surface gravity (log g)2.12±0.05 cgs
Temperature15,000±150 K
Rotational velocity (v sin i)39 km/s
Age8.3 Myr
Other designations
GX Vel, CD−44°5206, HD 79186, HIP 45085, HR 3654, SAO 220928
Database references
SIMBADdata

GX Velorum is a solitary variable star 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. 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. It may be a member of the Vela OB1 association of co-moving stars.

A light curve for GX Velorum, plotted from Hipparcos data

This object is a massive blue supergiant with a stellar classification of B5 Ia. It is suspected to be an Alpha Cygni-type pulsating variable and ranges in brightness from 4.97 down to 5.04 magnitude. It is losing mass at the rate of (0.40±0.02)×10 M☉ yr, or one solar mass every 2.5 million years. The star is 8.3 million years old with 35 times the mass of the Sun. It has expanded to around 61 times the Sun's radius and is radiating 214,000 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 15,000 K.

References

  1. ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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. S2CID 119257644.
  3. ^ Samus', N. N; et al. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  4. ^ 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.
  5. ^ 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. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  7. ^ Reed, B. Cameron (2000). "Vela OB1: Probable New Members and Hertzsprung-Russell Diagram". The Astronomical Journal. 119 (4): 1855–1859. Bibcode:2000AJ....119.1855R. doi:10.1086/301313.
  8. ^ 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. arXiv:1001.3337. Bibcode:2010MNRAS.404.1306F. doi:10.1111/j.1365-2966.2010.16392.x. S2CID 118674151.
  9. ^ Haucke, M.; et al. (June 2018), "Wind properties of variable B supergiants. Evidence of pulsations connected with mass-loss episodes", Astronomy & Astrophysics, 614: 28, arXiv:1902.01341, Bibcode:2018A&A...614A..91H, doi:10.1051/0004-6361/201731678, S2CID 126150688, A91
  10. ^ 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. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  11. "GX Vel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-16.
  12. 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. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
  13. "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
Constellation of Vela
Stars
Bayer
Variable
HR
HD
Other
Exoplanets
Star
clusters
NGC
Other
Nebulae
NGC
Other
Galaxies
NGC
Galaxy clusters
Category
Categories:
GX Velorum Add topic