HR Carinae

HR Car

HR Carinae and its nebula in Hydrogen-Alpha with MUSE
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])
Characteristics
Spectral type LBV[4] + RSG[5]
U−B color index −0.22[2]
B−V color index +0.92[2]
Variable type LBV[3]
Astrometry
Proper motion (μ) RA: –6.161[6] mas/yr
Dec.: +2.163[6] mas/yr
Parallax (π)0.1708 ± 0.0326 mas[6]
Distance4,370[7] pc
Absolute magnitude (MV)−9.4[4]
Orbit[5]
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°
Details
HR CarLBV
Mass25[8]–40[9] M☉
Radius220±60[5] (100[4]–350[9]) R☉
Luminosity416,000–790,000[10] L☉
Temperature7,900–21,900[10] K
Rotational velocity (v sin i)150[8] km/s
HR CarRSG
Mass9–20[5] M☉
Radius500±150[5] R☉
Temperature3,600–4,000[5] K
Other designations
HR Car, HD 90177, HIP 50843, SAO 238005, CD-59 3044, GC 14276, MWC 202, AAVSO 1019-59
Database references
SIMBADdata

HR Carinae is a luminous blue variable star located in the constellation Carina. It is surrounded by a vast nebula of ejected nuclear-processed material because this star has a multiple shell expanding atmosphere. This star is among the most luminous stars in the Milky Way. It has very broad emission wings on the Balmer lines, reminiscent from the broad lines observed in the spectra of O and Wolf–Rayet stars. A distance of 5 kpc and a bolometric magnitude of −9.4 put HR Car among the most luminous stars of the galaxy.

  1. ^ a b 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.
  2. ^ a b c 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. ^ a b 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.
  4. ^ a b c 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. ^ a b c d e f Boffin, Henri M. J.; Rivinius, Thomas; Merand, Antoine; Mehner, Andrea; Lebouquin, Jean-Baptiste; Pourbaix, Dimitri; De Wit, Willem-Jan; Martayan, Christophe; Guieu, Sylvain (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. hdl:2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/239364. S2CID 118399536.
  6. ^ a b c 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.
  7. ^ Groh, Jose H.; Stassun, Keivan G.; Drout, Maria R.; Murphy, Jeremiah W.; Aghakhanloo, Mojgan; Smith, Nathan (2019). "On the Gaia DR2 distances for Galactic luminous blue variables". Monthly Notices of the Royal Astronomical Society. 488 (2): 1760–1778. arXiv:1805.03298. Bibcode:2019MNRAS.488.1760S. doi:10.1093/mnras/stz1712. S2CID 119267371.
  8. ^ a b Groh, J. H.; Damineli, A.; Hillier, D. J.; Barbá, R.; Fernández-Lajús, E.; Gamen, R. C.; Moisés, A. P.; Solivella, G.; Teodoro, M. (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 (1): L25–L30. arXiv:0909.4459. Bibcode:2009ApJ...705L..25G. doi:10.1088/0004-637X/705/1/L25. S2CID 16609230.
  9. ^ a b 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. 387: 151–161. Bibcode:2002A&A...387..151M. doi:10.1051/0004-6361:20020295. pp. 151–161.
  10. ^ a b 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. S2CID 43688343.