Astronomy:V520 Carinae

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Short description: Star in the constellation Carina
V520 Carinae
Location of V520 Carinae (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Carina
Right ascension  10h 43m 32.28949s[1]
Declination −60° 33′ 59.8348″[1]
Apparent magnitude (V) +4.58[2] (4.50 to 4.59)
Characteristics
Spectral type K4III[3]
B−V color index +1.700±0.059[2]
Variable type Lc:[4]
Astrometry
Radial velocity (Rv)+9.1±0.3[2] km/s
Proper motion (μ) RA: −15.425[1] mas/yr
Dec.: +2.872[1] mas/yr
Parallax (π)2.2008 ± 0.1027[1] mas
Distance1,500+68
−62 ly
(460+21
−19 pc)
Absolute magnitude (MV)−3.63[2]
Details
Mass7.9±0.1[5] M☉
Radius217[6] R☉
Luminosity3,745[6] L☉
Temperature12,758[6] K
Age33.3±5.1[5] Myr
Other designations
w Car, V520 Car, NSV 4951, CD−59°3262, FK5 2524, GC 14762, HD 93070, HIP 52468, HR 4200, SAO 251090[7]
Database references
SIMBADdata

V520 Carinae is a single[8] 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.[2] It is located at a distance of approximately 1,500 light years from the Sun based on parallax,[9] and it is drifting further away with a radial velocity of +9 km/s.[2] It is a candidate member of the IC 2391 moving group of co-moving stars.[10]

A light curve for V520 Carinae, plotted from Hipparcos data[11]

This is an aging giant star with a stellar classification of K4III,[3] 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.[5] The star is radiating 12,000 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 3,745 K.[6]

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 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. 
  4. ↑ 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. 
  5. ↑ 5.0 5.1 5.2 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. 
  6. ↑ 6.0 6.1 6.2 6.3 Healy, Sarah; Horiuchi, Shunsaku; Colomer Molla, Marta; Milisavljevic, Dan; Tseng, Jeff; Bergin, Faith; Weil, Kathryn; Tanaka, Masaomi et al. (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, doi:10.1093/mnras/stae738, ISSN 0035-8711, Bibcode: 2024MNRAS.529.3630H 
  7. ↑ "V520 Car". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V520+Car. 
  8. ↑ 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. 
  9. ↑ 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, doi:10.3847/1538-3881/abd806, ISSN 0004-6256, Bibcode: 2021AJ....161..147B  Data about this star can be seen here.
  10. ↑ 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. 
  11. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  12. ↑ 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 
  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". Information Bulletin on Variable Stars 4659: 1-27. Bibcode: 1999IBVS.4659....1K. https://ibvs.konkoly.hu/pub/ibvs/4601/4659.pdf. Retrieved 11 January 2025. 
  14. ↑ V520 Carinae, https://www.aavso.org/vsx/index.php?view=detail.top&oid=6273, retrieved 2020-02-20 



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