Vela X-1
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| Observation data Equinox J2000.0 (ICRS) |
|
|---|---|
| Constellation | Vela |
| Right ascension | 09h 02m 06.860s |
| Declination | -40° 33′ 16.91″ |
| Apparent magnitude (V) | 6.76 to 6.99 (supergiant component) |
| Characteristics | |
| Spectral type | B0.5Ib (supergiant component) |
| U-B color index | -0.51 (supergiant component) |
| B-V color index | 0.50 (supergiant component) |
| Variable type | several causes |
| Astrometry | |
| Proper motion (μ) | RA: −5.81 mas/yr Dec.: 8.25 mas/yr |
| Distance | 6200±650 ly (1900±200 pc) |
| Other designations | |
| Data sources: | |
| Hipparcos Catalogue, GCVS (4.2), [1],[2] |
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Vela X-1 is a high-mass X-ray binary system. It consists of an X-ray pulsar in orbit around a supergiant. The period of the system is 8.964 days. The mass of the pulsar is estimated to be at least 1.88 solar masses.[3]
[edit] References
- ^ UBV, Hβ and polarization measurements of 1660 southern OB stars, G. Klare and Th. Neckel, Astron. Astrophys., Suppl. Ser. 27 (February 1977), pp. 215–247.
- ^ Ultraviolet spectroscopic observations of HD 77581 (Vela X-1 = 4U 0900-40), K. Sadakane et al., Astrophysical Journal 288 (January 1, 1985), pp. 284–291.
- ^ The mass of the neutron star in Vela X-1 and tidally induced non-radial oscillations in GP Vel, H. Quaintrell et al., Astronomy and Astrophysics 401 (April 2003), pp. 313–323; also, arXiv:astro-ph/0301243.
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