BD+60°2522
File:NGC 7635 annotated.jpg NGC 7635 surrounding BD+60 2522 Credit: NASA, ESA, and the Hubble Heritage Team (STScI/AURA) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cassiopeia |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 8.67[2] |
| Characteristics | |
| Spectral type | O6.5(f)(n)p[3] |
| U−B Template:Engvar | −0.62[2] |
| B−V Template:Engvar | +0.41[2] |
| Astrometry | |
| Radial velocity (Rv) | −26[4] km/s |
| Proper motion (μ) | RA: −2.662[1] mas/yr Dec.: 0.388[1] mas/yr |
| Parallax (π) | 0.3341±0.0152 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −5.5[5] |
| Details[6] | |
| Mass | 44 Template:Solar mass |
| Radius | 15 Template:Solar radius |
| Luminosity | 398,000 Template:Solar luminosity |
| Temperature | 37,500 K |
| Rotational velocity (v sin i) | 178 - 240 km/s |
| Age | 2[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| SAO 20575 IRAS 23185+6055 2MASS J23204452+6111404 | |
| Database references | |
| SIMBAD | data |
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BD+60°2522 is a bright O-type 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.[5] Direct spectroscopy yields a spectral class of O6.5 and an effective temperature around Script error: No such module "val".. It is a member of the Cassiopeia OB2 stellar association in the Perseus Arm[7] of the galaxy at about 8,500 light-years' distance.[8]
Although BD+60°2522 is around two million years old, the surrounding nebula is apparently only about 40,000 years old. The bubble is expected to be formed as a shock front where the stellar wind meets interstellar material at supersonic speeds. The wind from BD+60°2522 is travelling outwards at 1,800–2,500 km/s, causing the star to lose over a millionth of the mass of the Sun every year.[7]
References
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