Masses for VELA X-1 and other X-ray binaries

Details Masses for VELA X-1 and other X-ray binaries Masses for VELA X-1 and other X-ray binaries

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202l.131a&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 2, p. L131-L134.

Astronomy and Astrophysics

Astronomy

25

Binary Stars, Radiation Sources, Stellar Mass, X Ray Astronomy, X Ray Binaries, X Ray Stars, Chandrasekhar Equation, Eclipsing Binary Stars, Light (Visible Radiation), Orbital Velocity, White Dwarf Stars

Scientific paper

A detailed analysis of the optical light curve and other previously known observations of the X-ray binary Vela X-1 (3U 0900-40) is reported. All constraints are consistent only with a projected orbital velocity of the X-ray source of between 200 and 300 km/s. The allowed ranges of the masses and other parameters are estimated. If the mass of the X-ray source is less than the Chandrasekhar limit for white dwarfs, then the optical star must have an unusually small mass-to-radius ratio for its spectral type. The importance of the X-ray eclipse duration in determining binary parameters is emphasized, and some results are presented from analyses of observations of 3U 1700-37 and other X-ray binaries.

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