Alpha Pyxidis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Pyxis |
| Right ascension | 08h 43m 35.5375s[1] |
| Declination | –33° 11′ 10.988″[1] |
| Apparent magnitude (V) | 3.67[2] |
| Characteristics | |
| Spectral type | B1.5III[3] |
| U−B color index | –0.84[2] |
| B−V color index | –0.19[2] |
| Variable type | Beta Cephei[4] |
| Astrometry | |
| Radial velocity (Rv) | +15.3[5] km/s |
| Proper motion (μ) | RA: –14.28[1] mas/yr Dec.: +10.60[1] mas/yr |
| Parallax (π) | 3.86 ± 0.53[1] mas |
| Distance | approx. 800 ly (approx. 260 pc) |
| Details | |
| Mass | 10.7[4] M☉ |
| Radius | 6.3[4] R☉ |
| Surface gravity (log g) | 3.63[6] |
| Luminosity | 10,000[4] L☉ |
| Temperature | 24,300[6] K |
| Metallicity | ![\begin{smallmatrix}\left[\frac{Fe}{H}\right]\ =\ -0.18\end{smallmatrix}](/2012-wikipedia_en_all_nopic_01_2012/I/c2f4b8c82ed4f39fba0394ab83f318de.png) [6] |
| Rotational velocity (v sin i) | 11[7] km/s |
| Other designations | |
Alpha Pyxidis (α Pyx, α Pyxidis) is a giant star in the constellation Pyxis. It has a stellar classification of B1.5III and is a Beta Cephei variable. This star has more than ten times the mass of the Sun and is more than six times the Sun's radius. The surface temperature is 24,300 K and the star is about 10,000 times as luminous as the Sun.[3][4][6] Stars such as this with more than 10 solar masses are expected to end their life by exploding as a supernova.[9]
References
- ^ a b c d e Perryman, M. A. C.; Lindegren; Kovalevsky; Hoeg; Bastian; Bernacca; Crézé; Donati et al.; et al (April 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode 1997A&A...323L..49P.
- ^ a b c Fernie, J. D. (May 1983). "New UBVRI photometry for 900 supergiants". Astrophysical Journal Supplement Series 52: 7–22. Bibcode 1983ApJS...52....7F. doi:10.1086/190856.
- ^ a b Hiltner, W. A.; Garrison, R. F.; Schild, R. E. (July 1969). "MK Spectral Types for Bright Southern OB Stars". Astrophysical Journal 157: 313. Bibcode 1969ApJ...157..313H. doi:10.1086/150069.
- ^ a b c d e Hubrig, S.; Briquet, M.; De Cat, P.; Schoeller, M.; Morel, T.; Ilyin, I.; Briquet; De Cat; Schoeller; Morel; Ilyin (January 2009). New magnetic field measurements of beta Cephei stars and Slowly Pulsating B stars. 0901. pp. 3319. arXiv:0901.3319. Bibcode 2009arXiv0901.3319H.
- ^ Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institute of Washington D.C.. Bibcode 1953GCRV..C......0W.
- ^ a b c d Kilian, J. (February 1994). "Chemical abundances in early B-type stars. 5: Metal abundances and LTE/NLTE comparison". Astronomy and Astrophysics 282 (3): 867–873. Bibcode 1994A&A...282..867K.
- ^ Nieva, M. F.; Przybilla, N. (April 2008). "Carbon abundances of early B-type stars in the solar vicinity. Non-LTE line-formation for C II/III/IV and self-consistent atmospheric parameters". Astronomy and Astrophysics 481 (1): 199–216. Bibcode 2008A&A...481..199N. doi:10.1051/0004-6361:20078203.
- ^ "NSV 4220 -- Variable Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=NSV+4220. Retrieved 2010-02-23.
- ^ Reed, B. Cameron (June 28, 2005). "New Estimates of the Solar-Neighborhood Massive-Stars Birthrate and the Galactic Supernova Rate". The Astronomical Journal 130 (4): 1652. arXiv:astro-ph/0506708. Bibcode 2005AJ....130.1652R. doi:10.1086/444474.
External links
- Kaler, James. "Alpha Pyxidis". University of Illinois. http://stars.astro.illinois.edu/sow/alphapyx.html. Retrieved 2010-02-23.
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