Astronomy:V520 Carinae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 43m 32.29015s[2] |
| Declination | −60° 33′ 59.8308″[2] |
| Apparent magnitude (V) | +4.58[3] (4.50 to 4.59) |
| Characteristics | |
| Spectral type | K4III[4] |
| B−V color index | +1.700±0.059[3] |
| Variable type | Lc:[5] |
| Astrometry | |
| Radial velocity (Rv) | +9.1±0.3[3] km/s |
| Proper motion (μ) | RA: −14.75[2] mas/yr Dec.: +3.10[2] mas/yr |
| Parallax (π) | 2.86 ± 0.17[2] mas |
| Distance | 1,140 ± 70 ly (350 ± 20 pc) |
| Absolute magnitude (MV) | −3.63[3] |
| Details | |
| Mass | 7.9±0.1[6] M☉ |
| Radius | 131.18+4.67 −6.61[7] R☉ |
| Luminosity | 3,599±297[7] L☉ |
| Temperature | 3,903+102 −68[7] K |
| Age | 33.3±5.1[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
V520 Carinae is a single[9] star in the southern constellation of Carina. It has the Bayer designation w Carinae, while V520 Carinae is a variable star designation. The star has an orange hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around +4.58.[3] It is located at a distance of approximately 1,140 light years from the Sun based on parallax, and it is drifting further away with a radial velocity of +9 km/s.[3] It is a candidate member of the IC 2391 moving group of co-moving stars.[10]
This is an aging giant star with a stellar classification of K4III,[4] although Humphreys (1970) found a supergiant class of K3Ib.[11] It is a suspected slow irregular variable of type Lc and its brightness varies from magnitude +4.50 to +4.59 with no periodicity.[12] The star now has 131 times the girth of the Sun,[7] having exhausted the supply of hydrogen at its core then cooled and expanded. Comparison with theoretical evolutionary tracks suggests it is 33 million years old with 7.9 times the mass of the Sun,[6] although analysis of its motion suggests it may be an astrometric binary with a mass of 1.014 M☉.[13] The star is radiating 3,600[7] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,903 K.[7]
References
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 2.0 2.1 2.2 2.3 2.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode: 1978mcts.book.....H.
- ↑ Samus, N. N. et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1 61 (1): 80–88, doi:10.1134/S1063772917010085, Bibcode: 2017ARep...61...80S.
- ↑ 6.0 6.1 6.2 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.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 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.
- ↑ "V520 Car". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V520+Car.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society 389 (2): 869–879, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Montes, D. et al. (November 2001), "Late-type members of young stellar kinematic groups - I. Single stars", Monthly Notices of the Royal Astronomical Society 328 (1): 45–63, doi:10.1046/j.1365-8711.2001.04781.x, Bibcode: 2001MNRAS.328...45M.
- ↑ Humphreys, R. M. (June 1970), "The space distribution and kinematics of supergiants", Astronomical Journal 75: 602–623, doi:10.1086/110995, Bibcode: 1970AJ.....75..602H
- ↑ V520 Carinae, https://www.aavso.org/vsx/index.php?view=detail.top&oid=6273, retrieved 2020-02-20
- ↑ Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly", Astronomy and Astrophysics 623: A72, doi:10.1051/0004-6361/201834371, Bibcode: 2019A&A...623A..72K.
 |  |
