V528 Carinae

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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]
Distance 7,200 ± 500  ly
(2,200 ± 100  pc)
Absolute magnitude  (MV)−6.09 [5]
Details
Radius 700 [5]   R☉
Luminosity 81,000 [5]   L☉
Surface gravity (log g)0.0 [5]   cgs
Temperature 3,700 [5]   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
SIMBAD data

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

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, [8] while the Gaia Data Release 3 parallax of 0.45  mas implies a distance of around 7,200  light years (2,200 parsecs). [1] Assuming membership of the Carina OB2 membership would give a distance of about 1,830  parsecs . [9]

A light curve for V528 Carinae, plotted from Hipparcos data V528CarLightCurve.png
A light curve for V528 Carinae, plotted from Hipparcos data

V528 Carinae is a red supergiant of spectral type M2 Ib with an effective temperature of 3,700  K . It has a radius of 700 solar radii. [5] In the visible spectrum, its luminosity is 11,900 times higher than the Sun, [11] but the bolometric luminosity considering all wavelengths reaches around 81,000 L☉ [5] . 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

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References

  1. 1 2 3 4 5 6 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. 1 2 3 4 5 6 7 8 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. 1 2 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. ↑ 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.
  9. ↑ 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.
  10. ↑ "/ftp/cats/more/HIP/cdroms/cats". Centre de Données astronomiques de Strasbourg. Strasbourg astronomical Data Center. Retrieved 15 October 2022.
  11. ↑ 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.
  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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