R136b
R136b is a Wolf-Rayet star in the R136 cluster in the Large Magellanic Cloud.[4] 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 is the bright star towards the lower left. Credit: ESO | |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
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Constellation | Dorado |
Right ascension | 05h 38m 42.74s[1] |
Declination | −69° 06′ 03.78″[1] |
Apparent magnitude (V) | 13.24[1] |
Characteristics | |
Spectral type | O4If[2] |
B−V color index | −0.18[1] |
Astrometry | |
Distance | 163,000 ly (49,970[3] pc) |
Absolute magnitude (MV) | −7.75[2] |
Details[2] | |
Mass | 117+91 −51 M☉ |
Radius | 40.0 R☉ |
Luminosity | 2,188,000 L☉ |
Surface gravity (log g) | 3.30±0.25 cgs |
Temperature | 35,000±2,500 K |
Rotational velocity (v sin i) | 85 km/s |
Age | 1.7±0.2 Myr |
Other designations | |
Database references | |
SIMBAD | data |
R136b has the spectral type of Wolf-Rayet star, with strong 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.[5][2]
References
- Doran, E. I.; Crowther, P. A.; De Koter, A.; Evans, C. J.; McEvoy, C.; Walborn, N. R.; Bastian, N.; Bestenlehner, J. M.; Gräfener, G.; Herrero, A.; Köhler, K.; Maíz Apellániz, J.; Najarro, F.; Puls, J.; Sana, H.; Schneider, F. R. N.; Taylor, W. D.; Van Loon, J. Th.; Vink, J. S. (2013). "The VLT-FLAMES Tarantula Survey. XI. A census of the hot luminous stars and their feedback in 30 Doradus". Astronomy & Astrophysics. 558: A134. arXiv:1308.3412. Bibcode:2013A&A...558A.134D. doi:10.1051/0004-6361/201321824.
- Bestenlehner, Joachim M.; Crowther, Paul A.; Caballero-Nieves, Saida M.; Schneider, Fabian R. N.; Simón-Díaz, Sergio; Brands, Sarah A.; De Koter, Alex; Gräfener, Götz; Herrero, Artemio; Langer, Norbert; Lennon, Daniel J.; Maíz Apellániz, Jesus; Puls, Joachim; Vink, Jorick S. (2020). "The R136 star cluster dissected with Hubble Space Telescope/STIS. II. Physical properties of the most massive stars in R136". Monthly Notices of the Royal Astronomical Society. arXiv:2009.05136. Bibcode:2020MNRAS.tmp.2627B. doi:10.1093/mnras/staa2801.
- Pietrzyński, G; D. Graczyk; W. Gieren; I. B. Thompson; B. Pilecki; A. Udalski; I. Soszyński; et al. (7 March 2013). "An eclipsing-binary distance to the Large Magellanic Cloud accurate to two per cent". Nature. 495 (7439): 76–79. arXiv:1303.2063. Bibcode:2013Natur.495...76P. doi:10.1038/nature11878. PMID 23467166.
- Hainich, R.; Rühling, U.; Todt, H.; Oskinova, L. M.; Liermann, A.; Gräfener, G.; Foellmi, C.; Schnurr, O.; Hamann, W. -R. (2014). "The Wolf-Rayet stars in the Large Magellanic Cloud". Astronomy & Astrophysics. 565: A27. arXiv:1401.5474. Bibcode:2014A&A...565A..27H. doi:10.1051/0004-6361/201322696.
- Crowther, Paul A.; Schnurr, Olivier; Hirschi, Raphael; Yusof, Norhasliza; Parker, Richard J.; Goodwin, Simon P.; Kassim, Hasan Abu (2010). "The R136 star cluster hosts several stars whose individual masses greatly exceed the accepted 150Msolar stellar mass limit". Monthly Notices of the Royal Astronomical Society. 408 (2): 731. arXiv:1007.3284. Bibcode:2010MNRAS.408..731C. doi:10.1111/j.1365-2966.2010.17167.x.
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