Astronomy:GZ Velorum
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Short description: Star in the constellation Vela
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas |
| 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 | |
| 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]
References
- ↑ Kallinger, T.; Beck, P. G.; Hekker, S.; Huber, D.; Kuschnig, R.; Rockenbauer, M.; Winter, P. M.; Weiss, W. W. et al. (April 2019). "Stellar masses from granulation and oscillations of 23 bright red giants observed by BRITE-Constellation". Astronomy and Astrophysics 624: A35. doi:10.1051/0004-6361/201834514. Bibcode: 2019A&A...624A..35K.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
- ↑ 3.0 3.1 3.2 3.3 3.4 Hohle, M.M. et al. (2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H.
- ↑ 4.0 4.1 Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series 71: 245, doi:10.1086/191373, Bibcode: 1989ApJS...71..245K.
- ↑ 5.0 5.1 5.2 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, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 8.0 8.1 8.2 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T
- ↑ 9.0 9.1 9.2 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. doi:10.3847/1538-3881/ab1cbd. Bibcode: 2019AJ....158...20M.
- ↑ 10.0 10.1 10.2 Lèbre, A. et al. (May 2006), "Lithium abundances and rotational behavior for bright giant stars", Astronomy and Astrophysics 450 (3): 1173–1179, doi:10.1051/0004-6361:20053485, Bibcode: 2006A&A...450.1173L.
- ↑ "HD 89682". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+89682.
- ↑ Fuhrmann, K. et al. (2017), "Multiplicity among Solar-type Stars", The Astrophysical Journal 836 (1): 139, doi:10.3847/1538-4357/836/1/139, Bibcode: 2017ApJ...836..139F.
- ↑ 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, doi:10.1046/j.1365-8711.2002.05150.x, Bibcode: 2002MNRAS.331...45K.
- ↑ Richichi, A. et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics 431 (2): 773–777, doi:10.1051/0004-6361:20042039, Bibcode: 2005A&A...431..773R.
- ↑ Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1, https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41. The radius (R*) is given by:
- [math]\displaystyle{ \begin{align} 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{align} }[/math]
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