Westerlund 1-237
Possible red supergiant in the Westerlund 1 super star cluster / From Wikipedia, the free encyclopedia
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Westerlund 1-237 (commonly abbreviated to Wd 1-237) or Westerlund 1 BKS B is a possible red supergiant (RSG) in the constellation of Ara. It is one out of four known red supergiants in the Westerlund 1 super star cluster, although its outlying position, spectrum, and parallax, suggest it could be a foreground giant.[10] As a red supergiant, it would be one of the largest known stars and one of the most luminous of its type.[7]
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ara |
Right ascension | 16h 47m 03.1075s |
Declination | −45° 52′ 18.9572″ |
Apparent magnitude (V) | 19.008[1] |
Characteristics | |
Evolutionary stage | either a red supergiant or a foreground giant[2] |
Spectral type | M3Ia[3] or M6+ III[4] |
Apparent magnitude (B) | 22.8[citation needed] |
Apparent magnitude (R) | 13.634[1] |
Apparent magnitude (G) | 11.259[5] |
Apparent magnitude (J) | 5.075[6] |
Apparent magnitude (H) | 3.01[6] |
Apparent magnitude (K) | 2.18[6] |
Astrometry | |
Proper motion (μ) | RA: -3.09±0.15[5] mas/yr Dec.: -4.12±0.12[5] mas/yr |
Parallax (π) | 0.3370 ± 0.1235 mas[5] |
Distance | 3,000[7] or 623[8] pc |
Absolute magnitude (MV) | –6.96[9] |
Details | |
if a supergiant | |
Radius | 1,241±70[9] R☉ |
Luminosity | 219,000±26,000[9] L☉ |
Temperature | 3,550[9] - 3,605[8] K |
Age | 7.9[9] Myr |
if a foreground giant | |
Radius | 216[8] R☉ |
Luminosity | 1,000[2] or 7,178 – 7,379[8] L☉ |
Temperature | 3,605[8] K |
Other designations | |
Westerlund 1 W237, Westerlund 1 BKS B, 2MASS J16470309-4552189, Gaia EDR3 5940105904023386752 | |
Database references | |
SIMBAD | data |
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