GZ Velorum

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GZ Velorum
GZVelLightCurve.png
An R band light curve for GZ Velorum, adapted from Kallinger (2019) [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Vela
Right ascension 10h 19m 36.75198s [2]
Declination −55° 01′ 45.4852″ [2]
Apparent magnitude  (V)4.578 [3]
Characteristics
Spectral type K2.5 II [4]
B−V color index +1.635 [3]
Variable type LC [5]
Astrometry
Radial velocity (Rv)+12.9±0.8 [6]  km/s
Proper motion (μ)RA: −13.208 [2]   mas/yr
Dec.: +1.232 [2]   mas/yr
Parallax (π)2.4256 ± 0.1938  mas [2]
Distance 1,300 ± 100  ly
(410 ± 30  pc)
Absolute magnitude  (MV)−4.16 [7]
Details
Mass 8.9±0.5 [8]   M☉
Radius 136 [9]   R☉
Luminosity 2,679 - 2,780 [9]   L☉
Surface gravity (log g)2.0 [10]   cgs
Temperature 3,986 [9]   K
Metallicity [Fe/H]−0.4 [10]   dex
Rotational velocity (v sin i)2.0 [10]  km/s
Age 29.6±3.8 [8]   Myr
Other designations
GZ Vel, CD−54° 3415, FK5  2830, HD  89682, HIP  50555, HR  4063, SAO  237916 [11]
Database references
SIMBAD data

GZ Velorum is a single, [12] 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. [3] The star is located around 1,300  light years from Earth, as determined from its annual parallax shift of 2.4  mas . [2] It is moving further away with a heliocentric radial velocity of +13 km/s. [6]

This is a bright giant star with a stellar classification of K2.5 II. [4] It is a slow irregular variable of type LC [5] with a frequency of 0.16585 cycles per day. [13] In the R (red) band, the magnitude of the star ranges from 3.43 down to 3.81. [5] The measured angular diameter of this star, after correction for limb darkening, is 3.17±0.04 mas. [14] At the estimated distance of GZ Vel, this yields a physical size of about 140 times the radius of the Sun. [15]

GZ Vel is 30 million years old with 9 times the mass of the Sun. [8] It is radiating 9,241 [3] times the Sun's luminosity from its photosphere at an effective temperature of 4,140 K. [3]

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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. 1 2 3 4 5 6 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. 1 2 3 4 5 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. 1 2 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. 1 2 3 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. 1 2 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. 1 2 3 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. 1 2 3 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. 1 2 3 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:
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