GR Muscae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Musca |
| Right ascension | 12h 57m 37.153s [1] |
| Declination | −69° 17′ 18.98″ [1] |
GR Muscae, also known as 2S 1254-690 is a binary star system in the constellation Musca composed of a neutron star of between 1.2 and 1.8 times the mass of our Sun and a low-mass star likely to be around the mass of the Sun in close orbit.[2] A magnitude 19 blue star was pinpointed as the optical counterpart of the X-ray source in 1978.[3] Its apparent magnitude varies from 18 to 19.1 over a period of 0.16 days.[4]
The neutron star has an accretion disk that takes around 6.74 days to complete a revolution, and is inclined at an angle to the incoming stream of material from the donor star.[2]
References
- 1 2 "GR Muscae – Low Mass X-ray Binary". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 9 March 2014.
- 1 2 Cornelisse, R.; Kotze, M.M.; Casares, J.; Charles, P.A.; Hakala, P.J. (2013). "The Origin of the Tilted Disc in the Low-mass X-ray Binary GR Mus (XB 1254-690)" (PDF). Monthly Notices of the Royal Astronomical Society 436 (1): 910–20. Bibcode:2013MNRAS.436..910C. doi:10.1093/mnras/stt1654.
- ↑ Griffiths, R.E.; Gursky, H.; Schwartz, D.A.; Schwarz, J.; Bradt, H.; Doxsey, R.E.; Charles, P.A.; Thorstensen, J. R. (1978). "Positions and Identifications for Galactic X-ray Sources 2A1822-371 and 2S1254-690". Nature 276 (16): 247–49. Bibcode:1978Natur.276..247G. doi:10.1038/276247a0.
- ↑ Watson, Christopher Alberto (23 September 2013). "GR Muscae". AAVSO Website. American Association of Variable Star Observers. Bibcode:1978Natur.276..247G. Retrieved 9 March 2014.
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