V528 Carinae

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

Not to be confused with V538 Carinae.
V528 Carinae

Location of V528 Car
Observation data
Epoch J2000      Equinox J2000
Constellation Carina
Right ascension  11h 03m 06.15s[1]
Declination 60° 54′ 38.6″[1]
Apparent magnitude (V) +6.75[2]
Characteristics
Spectral type M2 Ib[3][4]
B−V color index +2.04[2]
Variable type Lc[5]
Astrometry
Radial velocity (Rv)−27.80[6] km/s
Proper motion (μ) RA: −7.13[7] mas/yr
Dec.: +1.875[7] mas/yr
Parallax (π)0.7027 ± 0.1159[7][1] mas
Distanceapprox. 4,600 ly
(approx. 1,400 pc)
Absolute magnitude (MV)−6.09[2]
Details
Radius415[8] R☉
Luminosity26,000 - 28,000[8] L☉
Surface gravity (log g)0.0[2] 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 of +6.75. It is a distant star but the exact distance is uncertain. The Hipparcos satellite gives a negative annual parallax and is not helpful, while the Gaia Data Release 2 parallax of 0.7027 mas implies a distance around 4,600 light years.[7] Assuming membership of the Carina OB2 membership gives a distance of about 3,850 light years.[9]

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 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.[9]

It is classified as a slow irregular variable whose prototype is TZ Cassiopeiae.[5]

References
  1. 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.
  2. 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.
  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. 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.
  6. 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.
  7. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  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.
  9. 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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