WR 31a
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WR 31a is surrounded by a blue bubble nebula created by a powerful stellar wind impacting material expelled during earlier stages of the star's life (ESA/Hubble & NASA Acknowledgement: Judy Schmidt)]] Credit: ESA/Hubble & NASA Acknowledgement: Judy Schmidt |
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Observation data Epoch J2000.0 Equinox J2000.0 |
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Constellation | Carina |
Right ascension | 10h 53m 59.586s[1] |
Declination | −60° 26′ 44.31″[1] |
Apparent magnitude (V) | 10.85[1] |
Characteristics | |
Spectral type | WN11h[2] |
Variable type | cLBV[3][dubious ] |
Astrometry | |
Proper motion (μ) | RA: −3.6[1] mas/yr Dec.: 4.0[1] mas/yr |
Distance | 8,000[2] pc |
Absolute magnitude (MV) | −6.71[4] |
Details[3] | |
Mass | 45[5][dubious ] M☉ |
Luminosity | 1,820,000[dubious ] L☉ |
Temperature | 30,200[dubious ] K |
Other designations | |
Database references | |
SIMBAD | data |
WR 31a is a Wolf-Rayet star in the southern constellation of Carina that is surrounded by an expanding optical blue bubble nebula[6] Some media sources have wrongly claimed this deep-sky object was recently discovered by the Hubble Space Telescope,[7] but this nebula was originally found by Ellen Dorrit Hoffleit in 1953 and designated as the planetary nebula Hf 39.[8] Other planetary nebula catalogue names included, He 3-319, ESO 128-18, and Wray 15-682.[8]
Since 2013, the object has been considered not as a planetary nebula but rather, an expanding gas shell, formally classified as a Wolf–Rayet nebula or WR nebula.[9] Its observed expansion velocity is 365 km.s−1, estimated to be some 2.4 parsecs across.[10]
Its central highly luminous star (TYC 8928-1166-1) is invisible to the naked-eye, shining at 10.85V magnitude,[11] whose spectral type is WN11h.[10] Mass of the central star is estimated to be at least 20 times that of the Sun, and it will likely become a supernova type II event in the future.[12] Distance is estimated to be about 9,200 parsecs or 30,000 light-years.
References
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