Xi Persei
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h 58m 57.90229s |
| Declination | +35° 47′ 27.7132″ |
| Apparent magnitude (V) | 4.06 |
| Characteristics | |
| Spectral type | O7.5III(n)((f))[1] |
| U−B color index | -0.89 |
| B−V color index | +0.02 |
| Variable type | slightly variable |
| Astrometry | |
| Radial velocity (Rv) | 70.1 km/s |
| Proper motion (μ) | RA: 3.62 mas/yr Dec.: 1.74 mas/yr |
| Parallax (π) | 2.62 ± 0.51 mas |
| Distance | approx. 1,200 ly (approx. 380 pc) |
| Absolute magnitude (MV) | −5.50[1] |
| Details | |
| Mass | 26[1]-36[2] M☉ |
| Radius | 14[2] R☉ |
| Luminosity | 263,000[1] L☉ |
| Surface gravity (log g) | 3.5[1] cgs |
| Temperature | 35,000[2] K |
| Rotation | 220[1] |
| Age | 2–3×106 years |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Persei (ξ Per) is a star in the constellation Perseus. It has the traditional name Menkib (Menchib, Menkhib, Al Mankib from Mankib al Thurayya (Arabic for "shoulder" [of the Pleiades]). Menkib has an apparent magnitude of +4.06 and is classified as a blue giant (spectral class O7.5III). It is approximately 1800 light years from Earth.
It is visually 12,700 times brighter than the Sun with absolute magnitude -5.5. If we include the ultraviolet light that emanates from Menkib its total, bolometric, luminosity is 263,000 times that of the Sun.
The star has a mass of some 30 solar masses and a surface temperature of 35,000 kelvins, making it one of the hottest stars that can be seen with the naked eye. The fluorescence of the California Nebula (NGC 1499) is due to this star’s prodigious radiation.
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Repolust, T.; Puls, J.; Herrero, A. (2004). "Stellar and wind parameters of Galactic O-stars". Astronomy and Astrophysics 415 (1): 349–376. Bibcode:2004A&A...415..349R. doi:10.1051/0004-6361:20034594.
- ↑ 2.0 2.1 2.2 Jiri Krticka; Jiri Kubat (2010). "CMF models of hot star winds I. Test of the Sobolev approximation in the case of pure line transitions". arXiv:1005.0258v2 [astro-ph.SR].
External links
- Image of Menkib from APOD
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