WR 2
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 05m 23.01436s[1] |
| Declination | +60° 25′ 18.9652″[1] |
| Apparent magnitude (V) | 11.33[2] |
| Characteristics | |
| Evolutionary stage | Wolf-Rayet
|
| Spectral type | WN2-w[3] |
| B−V color index | +0.16[2] |
| Absolute magnitude (MV) | −2.43[3] |
| Details | |
Myr | |
HIP 5100 | |
| Database references | |
| SIMBAD | data |
WR 2 is a
WR 2 is considered to be a member of the nitrogen sequence of WR stars, but completely lacks lines of NIII, NIV, NV, and HeI. Its spectrum is dominated by broad rounded
WR 2 is the smallest and hottest WN star known in the galaxy. Its unusual rounded emission lines are thought to be due to extremely fast rotation, although the exact rotation rate is not known. Estimates range from 500 km/s to approximately the breakup rate for the star of 1,900 km/s.[9][3][5] The high temperature also leads to a very fast stellar wind of 1,800 km/s,[3] although the overall rate of mass loss is one of the lowest for any Wolf-Rayet star.[10] The combination of a massive Wolf-Rayet star and rapid rotation is likely to result in a gamma-ray burst when the star explodes as a supernova.[9]
X-rays have been detected from WR 2 although they may not be due to colliding winds as is common for massive stars.[10]
References
- ^ S2CID 18759600.
- ^ Bibcode:2000A&A...355L..27H.
- ^ S2CID 18714731.
- .
- ^ S2CID 21732510.
- S2CID 118629873.
- ISSN 0365-0138.
- doi:10.1086/148556.
- ^ S2CID 119182468.
- ^ S2CID 119281411.
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