G0.238-0.071
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension 17h 46m 27.60s[1]
Declination −28° 46′ 11.8″[1]
Characteristics
Spectral type WN11h[2]
Apparent magnitude (J) 14.37[3]
Apparent magnitude (H) 11.29[3]
Apparent magnitude (K) 9.55[3]
Astrometry
Distance8000[3] pc
Absolute bolometric
magnitude (Mbol)		−12.01[3]
Details
Luminosity5,012,000[3] L☉
Other designations
G0.238-0.071, [DWC2011] 56, [MCD2010] 18
Database references
SIMBADdata

G0.238-0.071 is a Wolf-Rayet star[2] in the constellation of Sagittarius. It is located 26,000 light years away in the Galactic Center.[3]

Discovery

The star was first catalogued in a 2010 study about hot luminous stars in the galactic center where it was given the number 18.[2]

Properties

With a calculated luminosity of around 5 million L☉,[3] it is one of the most luminous known stars. Originally, it was thought to be a blue supergiant similar to P Cygni, but a later study classified it as a Wolf-Rayet star and gave it the spectral type WN11h, meaning it is a Wolf-Rayet star with hydrogen in it's spectrum, like R136a1 or WR 24.[2]

References

  1. 1 2 Dong, H.; Wang, Q. D.; Cotera, A.; Stolovy, S.; Morris, M. R.; Mauerhan, J.; Mills, E. A.; Schneider, G.; Calzetti, D.; Lang, C. (2011). "Hubble Space Telescope Paschen α survey of the Galactic Centre: Data reduction and products". Monthly Notices of the Royal Astronomical Society. 417 (1): 114–135. arXiv:1105.1703. Bibcode:2011MNRAS.417..114D. doi:10.1111/j.1365-2966.2011.19013.x. S2CID 11060463.
  2. 1 2 3 4 Clark, J. S.; Patrick, L. R.; Najarro, F.; Evans, C. J.; Lohr, M. (2021). "Constraining the population of isolated massive stars within the Central Molecular Zone". Astronomy and Astrophysics. 649: A43. arXiv:2102.08126. Bibcode:2021A&A...649A..43C. doi:10.1051/0004-6361/202039205. S2CID 231934076.
  3. 1 2 3 4 5 6 7 8 Stolovy, S. R.; Cotera, A.; Dong, H.; Morris, M. R.; Wang, Q. D.; Stolovy, S. R.; Lang, C. (2010). "Isolated Wolf-Rayet Stars and O Supergiants in the GalacticCenter Region Identified via Paschen-a Excess". The Astrophysical Journal. 725 (1): 188–199. arXiv:1009.2769. Bibcode:2010ApJ...725..188M. doi:10.1088/0004-637X/725/1/188. S2CID 20968628.
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