HR Carinae

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HR Car
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 22m 53.84074s[1]
Declination −59° 37′ 28.3774″[1]
Apparent magnitude (V) 8.42[2] (6.95 - 8.80[3])
Spectral type LBV[4]
U−B color index −0.22[2]
B−V color index +0.92[2]
Variable type LBV[3]
Proper motion (μ) RA: -6.87[1] mas/yr
Dec.: +2.33[1] mas/yr
Parallax (π)1.69 ± 0.82[1] mas
Distance5.4k[5] pc
Absolute magnitude (MV)-8.4[4]
Period (P)4557.5 ± 21.0 days
Semi-major axis (a)3.324 ± 0.026"
(18 AU)
Eccentricity (e)0.4 ± 0.2
Inclination (i)119.2 ± 0.7°
Mass25[6]- 40[7] M
Radius220[5] (100[4] - 350[7]R
Diameter220[5] (100[4] - 350[7]D
Luminosity416,000-790,000[8] L
Temperature7,900-21,900[8] K
Rotational velocity (v sin i)150[6] km/s
Other designations
HR Car, HD 90177, HIP 50843, SAO 238005, CD-59 3044, GC 14276, MWC 202, AAVSO 1019-59
Database references

HR Carinae is an LBV (luminous blue variable) star located in the Carina constellation. It is surrounded by a vast nebula of ejected nuclear-processed material, probably because this star has a multiple shell-structured expanding atmosphere. This star, along with most luminous blue variables, is among the most luminous stars in the Milky Way. It has very broad emission wings on the Balmer lines, which are reminiscent from the broad lines observed in the spectra of other O and Wolf–Rayet stars. A distance of 5 kiloparsecs and a bolometric magnitude of -9.4 place HR Carinae among the most luminous stars of the Milky Way.


  1. 1.0 1.1 1.2 1.3 1.4 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. 2.0 2.1 2.2 Drilling, J. S. (1991). "UBV photometry of OB+ stars in the southern Milky Way". The Astrophysical Journal Supplement Series 76: 1033. Bibcode 1991ApJS...76.1033D. doi:10.1086/191588.
  3. 3.0 3.1 Samus, N. N.Expression error: Unrecognized word "etal". (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.
  4. 4.0 4.1 4.2 Hutsemekers, D; van Drom, E. (1991). "HR Carinae - A luminous blue variable surrounded by an arc-shaped nebula". Astronomy and Astrophysics 281: 141–149. Bibcode 1991A&A...248..141H.
  5. 5.0 5.1 5.2 Boffin, Henri M. J.; Rivinius, Thomas; Merand, Antoine; Mehner, Andrea; Lebouquin, Jean-Baptiste; Pourbaix, Dimitri; De Wit, Willem-Jan; Martayan, Christophe et al. (2016). "The LBV HR Car has a partner: Discovery of a companion with the VLTI". Astronomy & Astrophysics 593: A90. arXiv:1607.07724. Bibcode 2016A&A...593A..90B. doi:10.1051/0004-6361/201629127.
  6. 6.0 6.1 Groh, J. H.; Damineli, A.; Hillier, D. J.; Barbá, R.; Fernández-Lajús, E.; Gamen, R. C.; Moisés, A. P.; Solivella, G. et al. (2009). "Bona Fide, Strong-Variable Galactic Luminous Blue Variable Stars Are Fast Rotators: Detection of a High Rotational Velocity in Hr Carinae". The Astrophysical Journal 705: L25. arXiv:0909.4459. Bibcode 2009ApJ...705L..25G. doi:10.1088/0004-637X/705/1/L25.
  7. 7.0 7.1 Machado, M. A. D.; de Araújo, F. X.; Pereira, C. B.; Fernandes, M. B. (2002). "HR Carinae: New spectroscopic data and physical parameters". Astronomy and Astrophysics (Astronomy and Astrophysics) 387: 151–161. Bibcode 2002A&A...387..151M. doi:10.1051/0004-6361:20020295. pp. 151-161.
  8. 8.0 8.1 Nazé, Y.; Rauw, G.; Hutsemékers, D. (2012). "The first X-ray survey of Galactic luminous blue variables". Astronomy & Astrophysics 538: A47. arXiv:1111.6375. Bibcode 2012A&A...538A..47N. doi:10.1051/0004-6361/201118040.

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