Astronomy:GX Velorum

From HandWiki
Short description: Star in the constellation Vela
GX Velorum
Vela constellation map.svg
Red circle.svg
Location of GX Velorum (circled)
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
Distanceapprox. 4,200 ly
(approx. 1,300 pc)
Absolute magnitude (MV)−7.20[7]
Details[8]
Mass35 M☉
Radius61±7[9] R☉
Luminosity214,000[9] L☉
Surface gravity (log g)2.12±0.05[9] cgs
Temperature15,000±150[9] K
Rotational velocity (v sin i)39 km/s
Age8.3[10] Myr
Other designations
GX Vel, CD−44°5206, HD 79186, HIP 45085, HR 3654, SAO 220928[11]
Database references
SIMBADdata

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]

A light curve for GX Velorum, plotted from Hipparcos data[13]

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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. ↑ 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. 
  11. ↑ "GX Vel". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=GX+Vel. 
  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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  13. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 



Retrieved from "https://handwiki.org/wiki/index.php?title=Astronomy:GX_Velorum&oldid=3423305"