A spectrographic orbit for LMC X-1 : another massive X-ray source ?
Abstract
Spectroscopy of the Pakull candidate star for LMC X-1 shows it to be an O7 star with a binary period of approximately 4 days. N III 4640-A emission has approximately antiphased velocities, which implies a mass ratio of 2-3. The secondary has a minimum mass of approximately 2.5 solar mass and a probable mass of 4 solar mass. The secondary is unlikely to be a normal star; if it is the X-ray source, it could be a black hole. A less probable orbit has a 1.34 day period and X-ray source masses greater than 1.9 solar mass.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- December 1983
- DOI:
- 10.1086/184168
- Bibcode:
- 1983ApJ...275L..43H
- Keywords:
-
- Binary Stars;
- Magellanic Clouds;
- O Stars;
- X Ray Sources;
- Circular Orbits;
- Line Spectra;
- Radial Velocity;
- Spectrographs;
- Stellar Mass;
- Astrophysics