HR Carinae

From Wikipedia, the free encyclopedia
Jump to: navigation, search
HR Car

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 22m 53.84074s
Declination −59° 37′ 28.3774″
Apparent magnitude (V) 7.57 (variable)
Characteristics
Spectral type B2ev
U−B color index 0.73
B−V color index 0.94
Variable type LBV
Astrometry
Proper motion (μ) RA: -6.87 mas/yr
Dec.: +2.33 mas/yr
Parallax (π) 1.69 ± 0.82 mas
Distance 17.7k[1] ly
(5.4k[1] pc)
Absolute magnitude (MV) -8.4[1]
Details
Radius 100[1] R
Luminosity 500,000[1] L
Temperature 15,000 (variable)[1] K
Other designations
HR Car, HD 90177, HIP 50843, SAO 238005.
Database references
SIMBAD data

HR Carinae is a supergiant, 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 our galaxy. It has very broad emission wings of the Balmer lines, reminiscent from the broad lines observed in the spectra of O and Wolf-Rayet stars. A kinematic distance of 5.4 kpc and a bolometric magnitude of -9.4 put HR Car among the most luminous stars of the galaxy.

Brightness variation[edit]

HR Carinae undergoes spectral variations apparently correlated with the light variations similarly to other luminous blue variables.

Characteristics[edit]

HR Carinae is a lot like Eta Carinae, both luminous blue variables, and both surrounded by ejected material. The only difference is their mass.

References[edit]

  1. ^ a b c d e f 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.