Astronomy:WR 101-2
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 45m 16.1s[2] |
| Declination | −28° 49′ 09″[2] |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet |
| Spectral type | Ofpe/WN9[2] |
| Astrometry | |
| Distance | 8,000[2] pc |
| Details | |
| Radius | 79[2] R☉ |
| Luminosity | 2,399,000[2] L☉ |
| Temperature | 20,000[2] K |
| Other designations | |
WR 101-2, CXOGC J174516.1-284909 | |
| Database references | |
| SIMBAD | data |
WR 101-2, also known as CXOGC J174516.1-284909, is a Wolf-Rayet star located in the Galactic Center, about 8,000 pc away from Earth. Its size has been estimated at 79 R☉.[2]
Properties
WR 101-2's spectral type is Ofpe/WN9,[2] signifying it as being a slash star, a Wolf-Rayet star which in this case contains extra nitrogen and helium emission in its spectrum as well as a P Cygni profile. Assuming a distance of 8,000 pc (appropriate as the massive star is apparently located in the Galactic Center, a structure known to be about 8,000 pc away), a K-band magnitude of 7.89, a K-band extinction of 1.7, and a K-band bolometric correction of -2.9, the luminosity turns out to be 2.4 million times that of the Sun (Log(L) = 6.38), making it one of the brightest stars known and certainly in the Galactic Center.[2]
WR 101-2's effective temperature was estimated to be about 20,000 K,[2] one of the coolest for any Wolf-Rayet star. The resulting radius for this is 129 R☉.
References
- ↑ "Wolf-Rayet Star Catalogue". http://pacrowther.staff.shef.ac.uk/WRcat/.
- ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 Mauerhan, J. C.; Muno, M. P.; Morris, M. R.; Stolovy, S. R.; Cotera, A. (2010-02-01). "Near-infrared Counterparts to Chandra X-ray Sources Toward the Galactic Center. II. Discovery of Wolf-Rayet Stars and O Supergiants". The Astrophysical Journal 710 (1): 706–728. doi:10.1088/0004-637X/710/1/706. ISSN 0004-637X. Bibcode: 2010ApJ...710..706M.
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