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GZ Velorum

Summary

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]

GZ Velorum

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]
Distance1,300 ± 100 ly
(410 ± 30 pc)
Absolute magnitude (MV)−4.16[7]
Details
Mass8.9±0.5[8] M☉
Radius136[9] R☉
Luminosity2,679 - 2,780[9] L☉
Surface gravity (log g)2.0[10] cgs
Temperature3,986[9] K
Metallicity [Fe/H]−0.4[10] dex
Rotational velocity (v sin i)2.0[10] km/s
Age29.6±3.8[8] Myr
Other designations
GZ Vel, CD−54° 3415, FK5 2830, HD 89682, HIP 50555, HR 4063, SAO 237916[11]
Database references
SIMBADdata

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]

References edit

  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. ^ a b c d e f 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. ^ a b c d e 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. ^ a b 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. ^ a b c 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. ^ a b 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. ^ a b c 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. ^ a b c 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. ^ a b c 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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