The optical orbit of the X-ray pulsar binary 0535 - 668 (= A0538 - 66)

Details The optical orbit of the X-ray pulsar binary 0535 - 668 (= A0538 - 66) The optical orbit of the X-ray pulsar binary 0535 - 668 (= A0538 - 66)

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pasp...97..418h&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 97, May 1985, p. 418-422.

Astronomy and Astrophysics

Astronomy

26

Binary Stars, Pulsars, Stellar Orbits, X Ray Sources, Eccentric Orbits, Radial Velocity, Stellar Mass

Scientific paper

Spectroscopic data are presented from the optical primary of the LMC X-ray source 0535 - 668 during its optical low state. From these data the star appears as a normal B1 star, slightly evolved off the main sequence. Adopting the X-ray outburst period of 16.65 days, radial velocities indicate an orbit with a high eccentricity, and periastron passage very close to the X-ray flux peak. Probable masses are normal for the primary and the pulsar. At periastron, the center of mass separation is less than the primary-star diameter, and during optical outburst the photosphere is larger than the minimum separation. Orbital parameters and implied quantities are discussed.

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