A spectrographic orbit for LMC X-1 - Another massive X-ray source?

Details A spectrographic orbit for LMC X-1 - Another massive X-ray source? A spectrographic orbit for LMC X-1 - Another massive X-ray source?

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275l..43h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 275, Dec. 15, 1983, p. L43-L47. NSF-supported resea

Astronomy and Astrophysics

Astrophysics

45

Binary Stars, Magellanic Clouds, O Stars, X Ray Sources, Circular Orbits, Line Spectra, Radial Velocity, Spectrographs, Stellar Mass

Scientific paper

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.

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