The orbit of the supergiant component of VELA X-1 derived from IUE radial velocities

Details The orbit of the supergiant component of VELA X-1 derived from IUE radial velocities The orbit of the supergiant component of VELA X-1 derived from IUE radial velocities

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.286l..21s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 2, pp. L21-L24.

Astronomy and Astrophysics

Astronomy

10

Binaries: General, Stars: Individual: Hd 77581, Stars: Individual: Vela X-1

Scientific paper

47 short-wavelength, high-resolution IUE spectra have been used to derive the orbital elements of HD 77581, the supergiant companion to the neutron star in the X-ray source Vela X-1; the velocity amplitude is at the lower end of the range found by previous workers using primarily optical spectra, but other elements (e, omega) are in fair agreement with those derived from pulse timing studies of the X-ray source. The new results indicate that the mass of the neutron star is close to 1.4 M_solar and is not significantly larger than those measured for other members of this class of object.

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