R136b
 R136b is the bright star towards the lower left. Credit: ESO |
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) |
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|---|---|
| Constellation | Dorado |
| Right ascension | 05h 38m 42.74s |
| Declination | −69° 06′ 03.78″ |
| Apparent magnitude (V) | 13.24 |
| Characteristics | |
| Spectral type | O4If/WN8 |
| B−V color index | −0.18 |
| Astrometry | |
| Distance | 163,000 ly (49,970pc) |
| Absolute magnitude (MV) | −7.31 |
| Details | |
| Mass | 93 M☉ |
| Radius | 22.3 R☉ |
| Luminosity | 1,995,000 L☉ |
| Temperature | 41,000 K |
| Age | 1.5 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
R136b is a Wolf-Rayet star in the R136 cluster in the Large Magellanic Cloud. It is one of the most massive and most luminous stars known. It is found in the dense R136 open cluster at the centre of NGC 2070 in the Tarantula Nebula.
R136b has a transitional spectral type between an O class supergiant and a Wolf-Rayet star, with a mix of absorption and emission lines. Although it shows enhanced helium and nitrogen at its surface, it is still a very young star, still burning hydrogen in its core via the CNO cycle, and still effectively a main sequence object.
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