Sher 25
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| Observation data Epoch J2000.0 Equinox J2000.0 |
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| Constellation | Carina |
| Right ascension | 11h 15m 7.8s |
| Declination | -61° 15′ 17.0″ |
| Apparent magnitude (V) | +12.2 |
| Characteristics | |
| Spectral type | B1.5Iab |
| Variable type | Luminous Blue Variable |
| Astrometry | |
| Distance | 20,000 ly (6,100 pc) |
| Absolute magnitude (MV) | -7 |
| Details | |
| Mass | 60 M☉ |
| Radius | 35.0 R☉ |
| Luminosity | ~1,000,000 L☉ |
| Temperature | 30,000 K |
| Age | Approx. 5 million years |
| Other designations | |
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Sher 25
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Sher 25[1] is an old blue supergiant star located approximately 20,000 light years from the Sun in the H II region NGC 3603 of the Milky Way galaxy. It's a spectral type B1.5Iab (Blue Supergiant) star with an apparent magnitude is 12.2, and located at right ascension 11h 15m 7.8s, declination -61° 15′ 17″[2] in the constellation Carina. It is commonly thought that Sher 25 is near the point of going supernova, as it has recently thrown off matter in a pattern similar to that of the supernova 1987A in the Large Magellanic Cloud, with a circumstellar ring and bipolar outflow filaments. Its mass is equivalent to 60 times the mass of our Sun (solar masses). Most stars that are the size of Sher 25 may leave a pulsar remnant. The temperature is estimated to be about 30,000 Kelvin (54,000 Fahrenheit)
[edit] References
- ^ Sher, David: Distances of five open cluster near Eta Carinae, Monthly Notices of the Royal Astronomical Society, 1965, Vol. 129, p.250[1]
- ^ Brandner, Wolfgang; Grebel, Eva K.; Chu, You-Hua; Weis, Kerstin (January 1997). "Ring Nebula and Bipolar Outflows Associated with the B1.5 Supergiant Sher 25 in NGC 3603". Astrophysical Journal Letters 475: L45. arXiv:astro-ph/9611046. Bibcode 1997ApJ...475L..45B. doi:10.1086/310460.
[edit] External links
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