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GZ Velorum

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Star in the constellation Vela
GZ Velorum

An R band light curve for GZ Velorum, adapted from Kallinger (2019)
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10 19 36.75198
Declination −55° 01′ 45.4852″
Apparent magnitude (V) 4.578
Characteristics
Spectral type K2.5 II
B−V color index +1.635
Variable type LC
Astrometry
Radial velocity (Rv)+12.9±0.8 km/s
Proper motion (μ) RA: −13.208 mas/yr
Dec.: +1.232 mas/yr
Parallax (π)2.4256 ± 0.1938 mas
Distance1,300 ± 100 ly
(410 ± 30 pc)
Absolute magnitude (MV)−4.16
Details
Mass8.9±0.5 M☉
Radius136 R☉
Luminosity2,679 - 2,780 L☉
Surface gravity (log g)2.0 cgs
Temperature3,986 K
Metallicity −0.4 dex
Rotational velocity (v sin i)2.0 km/s
Age29.6±3.8 Myr
Other designations
GZ Vel, CD−54° 3415, FK5 2830, HD 89682, HIP 50555, HR 4063, SAO 237916
Database references
SIMBADdata

GZ Velorum is a single, 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. The star is located around 1,300 light years from Earth, as determined from its annual parallax shift of 2.4 mas. It is moving further away with a heliocentric radial velocity of +13 km/s.

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

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

References

  1. Kallinger, T.; Beck, P. G.; Hekker, S.; Huber, D.; Kuschnig, R.; Rockenbauer, M.; Winter, P. M.; Weiss, W. W.; Handler, G.; Moffat, A. F. J.; Pigulski, A.; Popowicz, A.; Wade, G. A.; Zwintz, K. (April 2019). "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation". Astronomy and Astrophysics. 624: A35. arXiv:1902.07531. Bibcode:2019A&A...624A..35K. doi:10.1051/0004-6361/201834514.
  2. ^ 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.
  3. ^ 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, S2CID 111387483.
  4. ^ 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, S2CID 123149047.
  5. ^ 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 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID 125853869.
  6. ^ 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, S2CID 119231169.
  7. 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.
  8. ^ 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
  9. ^ 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 (1): 20. arXiv:1905.03744. Bibcode:2019AJ....158...20M. doi:10.3847/1538-3881/ab1cbd. S2CID 148571616.
  10. ^ Lèbre, A.; et al. (May 2006), "Lithium abundances and rotational behavior for bright giant stars" (PDF), Astronomy and Astrophysics, 450 (3): 1173–1179, Bibcode:2006A&A...450.1173L, doi:10.1051/0004-6361:20053485.
  11. "HD 89682". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 16 August 2018.
  12. Fuhrmann, K.; et al. (2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal, 836 (1): 139, Bibcode:2017ApJ...836..139F, doi:10.3847/1538-4357/836/1/139.
  13. 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, S2CID 10505995.
  14. Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
  15. Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R*) is given by:
    2 ⋅ R ∗ = ( 412 ⋅ 3.17 ⋅ 10 − 3 )   AU 0.0046491   AU / R ⨀ ≈ 281 ⋅ R ⨀ {\displaystyle {\begin{aligned}2\cdot R_{*}&={\frac {(412\cdot 3.17\cdot 10^{-3})\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 281\cdot R_{\bigodot }\end{aligned}}}
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