WR 102ea
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sagittarius |
| Right ascension | 17h 46m 15.12s |
| Declination | −28° 49′ 36.9″ |
| Characteristics | |
| Evolutionary stage | Wolf Rayet |
| Spectral type | WN9h[1] |
| Apparent magnitude (K) | 8.8[2] |
| Astrometry | |
| Radial velocity (Rv) | 116 km/s |
| Distance | 26k[1] ly (8k[1] pc) |
| Details | |
| Mass | 58[3] M☉ |
| Radius | 86[1] R☉ |
| Luminosity | 2.5 × 106[1] L☉ |
| Temperature | 25,100[1] K |
| Age | probably 4 × 106 years |
| Other designations | |
FMM 241, qF 241, (erroneously QPM-241), Q10, MGM 5-10, LHO 71 | |
| Database references | |
| SIMBAD | data |
WR 102ea is a Wolf–Rayet star in the Sagittarius constellation. It is the second most luminous star in the Quintuplet cluster after WR 102hb. With a luminosity of 2,500,000 times solar, it is also one of the most luminous stars known. Despite the high luminosity it can only be observed at infra-red wavelengths due to the dimming effect of intervening dust on visual light.
It is an evolved massive star which has an emission line spectrum from a strong stellar wind caused by high luminosity and the presence of elements heavier than hydrogen in the photosphere. The spectrum is dominated by ionised helium and nitrogen lines due to convectional and rotational mixing of fusion products to the surface of the star. However it is still in a core hydrogen burning phase and hydrogen lines are also visible in the spectrum, in contrast to WN stars without hydrogen which are older, less massive, and less luminous.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Liermann, A.; Hamann, W. -R.; Oskinova, L. M.; Todt, H.; Butler, K. (2010). "The Quintuplet cluster". Astronomy & Astrophysics 524: A82. arXiv:1011.5796. Bibcode:2010A&A...524A..82L. doi:10.1051/0004-6361/200912612.
- ↑ Liermann, A.; Hamann, W. -R.; Oskinova, L. M. (2009). "The Quintuplet cluster". Astronomy and Astrophysics 494 (3): 1137. arXiv:0809.5199. Bibcode:2009A&A...494.1137L. doi:10.1051/0004-6361:200810371.
- ↑ Adriane Liermann et all (2011). "High-mass stars in the Galactic center Quintuplet cluster". Bulletin de la Societe Royale des Sciences de Liege 80: 160-164.
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