V528 Carinae

V528 Carinae (V528 Car, HD 95950, HIP 54021) is a variable star in the constellation Carina.

V528 Carinae
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension 11h 03m 06.15s[1]
Declination 60° 54′ 38.6″[1]
Apparent magnitude (V) 6.27 - 6.78[2]
Characteristics
Spectral type M2 Ib:[3][4]
B−V color index +2.04[5]
Variable type Lc[6]
Astrometry
Radial velocity (Rv)−27.80[7] km/s
Proper motion (μ) RA: –7.639[1] mas/yr
Dec.: +2.109[1] mas/yr
Parallax (π)0.4504 ± 0.0293 mas[1]
Distance7,200 ± 500 ly
(2,200 ± 100 pc)
Absolute magnitude (MV)−6.09[5]
Details
Radius415[8] R☉
Luminosity26,000 - 28,000[8] L☉
Surface gravity (log g)0.0[5] cgs
Temperature3,660±170[8] K
Other designations
V528 Car, CD−60°3327, HD 95950, HIP 54021, 2MASS J11030616-6054387, IRAS 11010-6038, WISE J110305.99-605438.7, SAO 251235
Database references
SIMBADdata

V528 Carinae has an apparent visual magnitude that varies between about 6.3 and 6.8. It is a distant star but the exact distance is uncertain. The Hipparcos satellite gives a negative annual parallax and is not helpful,[9] while the Gaia Data Release 3 parallax of 0.45 mas implies a distance around 7,200 light years.[1] Assuming membership of the Carina OB2 membership would give a distance of about 1,830 parsecs.[10]

A light curve for V528 Carinae, plotted from Hipparcos data[11]

V528 Carinae is a red supergiant of spectral type M2 Ib with an effective temperature of 3,660 K. It has a radius of 415 solar radii. In the visible spectrum, its luminosity is 11,900 times higher than the sun, but the bolometric luminosity considering all wavelengths reaches around 30,000 L☉.[8] It loses mass at 0.5×10−9 M☉ per year.[12]

It is classified as a slow irregular variable whose prototype is TZ Cassiopeiae.[6]

See also

References
  1. 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.
  2. "V528 Car". International Variable Star Index. AAVSO. Retrieved 2022-11-25.
  3. Humphreys, Roberta M.; Strecker, Donald W.; Ney, E. P. (1972). "Spectroscopic and Photometric Observations of M Supergiants in Carina". Astrophysical Journal. 172: 75. Bibcode:1972ApJ...172...75H. doi:10.1086/151329.
  4. Malyuto, V.; Oestreicher, M. O.; Schmidt-Kaler, Th. (1997). "Quantitative spectral classification of galactic disc K-M stars from spectrophotometric measurements". Monthly Notices of the Royal Astronomical Society. 286 (2): 500. Bibcode:1997MNRAS.286..500M. doi:10.1093/mnras/286.2.500.
  5. Levesque, Emily M.; Massey, Philip; Olsen, K. A. G.; Plez, Bertrand; Josselin, Eric; Maeder, Andre; Meynet, Georges (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal. 628 (2): 973–985. arXiv:astro-ph/0504337. Bibcode:2005ApJ...628..973L. doi:10.1086/430901. S2CID 15109583.
  6. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  7. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 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.
  8. 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.
  9. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  10. Melnik, A. M.; Dambis, A. K. (2020). "Distance scale for high-luminosity stars in OB associations and in field with Gaia DR2. Spurious systematic motions". Astrophysics and Space Science. 365 (7): 112. arXiv:2006.14649. Bibcode:2020Ap&SS.365..112M. doi:10.1007/s10509-020-03827-0. S2CID 220128144.
  11. "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  12. Josselin, E.; Blommaert, J. A. D. L.; Groenewegen, M. A. T.; Omont, A.; Li, F. L. (2000). "Observational investigation of mass loss of M supergiants". Astronomy and Astrophysics. 357: 225. Bibcode:2000A&A...357..225J.
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