BD+60 2522
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 BD+60 2522 showing a portion of the surrounding Bubble Nebula | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 23h 20m 44.5203s |
| Declination | +61° 11′ 40.561″ |
| Apparent magnitude (V) | 8.71 |
| Characteristics | |
| Spectral type | O6.5(f)(n)p |
| U−B color index | -0.58 |
| B−V color index | 0.33 |
| Variable type | None |
| Astrometry | |
| Radial velocity (Rv) | −26 km/s |
| Proper motion (μ) | RA: 3.1 mas/yr Dec.: 4.6 mas/yr |
| Parallax (π) | 13.0 ± 8.0 mas |
| Distance | 2.4[1]k pc |
| Absolute magnitude (MV) | -5.5[1] |
| Details | |
| Mass | 44[2] M☉ |
| Radius | 15 R☉ |
| Luminosity | 398,000[2] L☉ |
| Temperature | 37,500[2] K |
| Rotation | 178-240[2] |
| Other designations | |
| Database references | |
| SIMBAD | data |
SAO 20575 or BD+60°2522 is a bright O-class star that has produced the Bubble Nebula (NGC 7635) with its stellar wind. The exact classification of the star is uncertain, with a number of spectral peculiarities and inconsistencies between the appearance of the star itself and the effects on the nearby nebulosity, but it is undoubtedly a highly luminous hot massive star.[1] Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around 37,500K.
References
- ↑ 1.0 1.1 1.2 Moore, B. D.; Walter, D. K.; Hester, J. J.; Scowen, P. A.; Dufour, R. J.; Buckalew, B. A. (2002). "\ITAL]Hubble Space Telescope\/ITAL] Observations of the Windblown Nebula NGC 7635". The Astronomical Journal 124 (6): 3313. doi:10.1086/344596.
- ↑ 2.0 2.1 2.2 2.3 Rauw, G.; De Becker, M.; Vreux, J. -M. (2003). "Line profile variability in the spectra of Oef stars". Astronomy and Astrophysics 399: 287. doi:10.1051/0004-6361:20021776.
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