GZ Velorum

GZ Velorum is a single,[11] orange-hued star in the southern constellation of Vela. It is a faint star but visible to the naked eye, having an apparent visual magnitude of 4.58.[2] The star is located around 1,300 light years from Earth, as determined from its annual parallax shift of 2.4 mas.[1] It is moving further away with a heliocentric radial velocity of +13 km/s.[5]

GZ Velorum
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension  10h 19m 36.75198s[1]
Declination −55° 01′ 45.4852″[1]
Apparent magnitude (V) 4.578[2]
Characteristics
Spectral type K2.5 II[3]
B−V color index +1.635[2]
Variable type LC[4]
Astrometry
Radial velocity (Rv)+12.9±0.8[5] km/s
Proper motion (μ) RA: −13.208[1] mas/yr
Dec.: +1.232[1] mas/yr
Parallax (π)2.4256 ± 0.1938[1] mas
Distance1,300 ± 100 ly
(410 ± 30 pc)
Absolute magnitude (MV)−4.16[6]
Details
Mass8.9±0.5[7] M☉
Radius136[8] R☉
Luminosity2,679 - 2,780[8] L☉
Surface gravity (log g)2.0[9] cgs
Temperature3,986[8] K
Metallicity [Fe/H]−0.4[9] dex
Rotational velocity (v sin i)2.0[9] km/s
Age29.6±3.8[7] Myr
Other designations
GZ Vel, CD−54° 3415, FK5 2830, HD 89682, HIP 50555, HR 4063, SAO 237916[10]
Database references
SIMBADdata

This is a bright giant star with a stellar classification of K2.5 II.[3] It is a slow irregular variable of type LC[4] with a frequency of 0.16585 cycles per day.[12] In the R (red) band, the magnitude of the star ranges from 3.43 down to 3.81.[4] The measured angular diameter of this star, after correction for limb darkening, is 3.17±0.04 mas.[13] At the estimated distance of GZ Vel, this yields a physical size of about 140 times the radius of the Sun.[14]

GZ Vel is 30 million years old with 9 times the mass of the Sun.[7] It is radiating 9,241[2] times the Sun's luminosity from its photosphere at an effective temperature of 4,140 K.[2]

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. Hohle, M.M.; et al. (2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten, 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355.
  3. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017), "General catalogue of variable stars: Version GCVS 5.1", Astronomy Reports, 61: 80, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. 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.
  7. 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
  8. Messineo, M.; Brown, A. G. A. (2019). "A Catalog of Known Galactic K-M Stars of Class I Candidate Red Supergiants in Gaia DR2". The Astronomical Journal. 158: 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd.
  9. Lèbre, A.; et al. (May 2006), "Lithium abundances and rotational behavior for bright giant stars", Astronomy and Astrophysics, 450 (3): 1173–1179, Bibcode:2006A&A...450.1173L, doi:10.1051/0004-6361:20053485.
  10. "HD 89682". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 August 2018.
  11. Fuhrmann, K.; et al. (2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal, 836: 139, Bibcode:2017ApJ...836..139F, doi:10.3847/1538-4357/836/1/139.
  12. Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
  13. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  14. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
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