V520 Carinae

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V520 Carinae
V520CarLightCurve.png
A light curve for V520 Carinae, plotted from Hipparcos data [1]
Observation data
Epoch J2000       Equinox J2000
Constellation Carina
Right ascension 10h 43m 32.28949s [2]
Declination −60° 33′ 59.8348″ [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: −15.425  mas/yr [2]
Dec.: +2.872  mas/yr [2]
Parallax (π)2.2008 ± 0.1027  mas [2]
Distance 1,500+68
−62  ly
(460+21
−19  pc) [6]
Absolute magnitude  (MV)−3.63 [3]
Details
Mass 7.9±0.1 [7]   M☉
Radius 217 [8]   R☉
Luminosity 3,745 [8]   L☉
Temperature 12,758 [8]   K
Age 33.3±5.1 [7]   Myr
Other designations
w Car, V520 Car, NSV  4951, CD−59°3262, FK5  2524, GC  14762, HD  93070, HIP  52468, HR  4200, SAO  251090 [9]
Database references
SIMBAD data

V520 Carinae is a single [10] 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 1,500  light years from the Sun based on parallax, [6] 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. [11]

This is an aging giant star with a stellar classification of K4III, [4] although Humphreys (1970) found a supergiant class of K3Ib. [12] It was found to be a variable star when the Hipparcos data was analyzed, and for that reason it was given a variable star designation in 1999. [13] It is a slow irregular variable of type Lc and its brightness varies from magnitude +4.50 to +4.59 with no periodicity. [14] The star now has 217 times the radius of the Sun, 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. [7] The star is radiating 12,000 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,745 K. [8]

References

  1. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  2. 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 3 4 5 6 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.
  4. 1 2 Houk, Nancy; Cowley, A. P. (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 1, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  5. ↑ Samus, N. N.; et al. (2017), "General Catalogue of Variable Stars", Astronomy Reports, 5.1, 61 (1): 80–88, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085, S2CID   125853869.
  6. 1 2 Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01), "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3", The Astronomical Journal, 161 (3): 147, arXiv: 2012.05220 , Bibcode:2021AJ....161..147B, doi: 10.3847/1538-3881/abd806 , ISSN   0004-6256 Data about this star can be seen here.
  7. 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.
  8. 1 2 3 4 Healy, Sarah; Horiuchi, Shunsaku; Colomer Molla, Marta; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi; Otero, Sebastián (2024-04-01), "Red supergiant candidates for multimessenger monitoring of the next Galactic supernova", Monthly Notices of the Royal Astronomical Society, 529 (4): 3630–3650, arXiv: 2307.08785 , Bibcode:2024MNRAS.529.3630H, doi: 10.1093/mnras/stae738 , ISSN   0035-8711
  9. ↑ "V520 Car". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-19.
  10. ↑ 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, arXiv: 0806.2878 , Bibcode:2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x , S2CID   14878976.
  11. ↑ 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, arXiv: astro-ph/0106537 , Bibcode:2001MNRAS.328...45M, doi: 10.1046/j.1365-8711.2001.04781.x , S2CID   55727428.
  12. ↑ Humphreys, R. M. (June 1970), "The space distribution and kinematics of supergiants", Astronomical Journal, 75: 602–623, Bibcode:1970AJ.....75..602H, doi:10.1086/110995
  13. ↑ Kazarovets, E. V.; Samus, N. N.; Durlevich, O. V.; Frolov, M. S.; Antipin, S. V.; Kireeva, N. N.; Pastukhova, E. N. (January 1999). "The 74th Special Name-list of Variable Stars" (PDF). Information Bulletin on Variable Stars. 4659: 1–27. Bibcode:1999IBVS.4659....1K . Retrieved 11 January 2025.
  14. ↑ "V520 Carinae", Variable Star Index, retrieved 2020-02-20
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