Anomalous periastron positions in X-ray binaries

Details Anomalous periastron positions in X-ray binaries Anomalous periastron positions in X-ray binaries

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....70..763m&link_type=abstract

Astronomy and Astrophysics, vol. 70, no. 6, Dec. 1978, p. 763-767. Research supported by the United States-Israel Binational Sc

Astronomy and Astrophysics

Astrophysics

10

Apsides, Binary Stars, Orbital Elements, X Ray Binaries, X Ray Sources, Circular Orbits, Early Stars, Eccentricity, Stellar Winds

Scientific paper

The values of the periastron position (omega) are expected to be uniformly distributed between 0 and 2 pi if they are true orbital parameters. Instead, all the values that have been determined from optical velocity curves fall very near omega = 0 for X-ray binaries with early type primaries. The observed clustering near omega = 0 is explained by phase-dependent absorption in a stellar wind. A spurious eccentricity is produced by this absorption. However, the peak-to-peak velocity amplitude, which is used in the determination of the neutron star mass, is unaffected to first order in the eccentricity.

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