The optical spectrum of HDE 226868 = Cygnus X-1. I - Radial velocities and orbital elements

Details The optical spectrum of HDE 226868 = Cygnus X-1. I - Radial velocities and orbital elements The optical spectrum of HDE 226868 = Cygnus X-1. I - Radial velocities and orbital elements

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..240g&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 1, 1982, p. 240-248. Research supported by the National Research Council of Cana

Astronomy and Astrophysics

Astronomy

90

Binary Stars, Stellar Spectra, X Ray Astronomy, Orbital Elements, Radial Velocity, Spectrograms, Tables (Data)

Scientific paper

We have measured radial velocities for HDE 226868 from 78 high-dispersion spectrograms obtained between 1971 and 1981. The orbital elements derived from these data are essentially identical to those previously reported, except that we find the eccentricity is not statistically significant. The latter conclusion is independent of whether we consider our data as a whole or break it up into blocks obtained over a short period of time. Thus we cannot confirm the short-period apsidal motion that has been suggested by variations in the shape of the ellipsoidal light curve. The velocity curve derived from the hydrogen line radial velocities is distorted by the blending of emission with the absorption lines, but we find no evidence that the velocity curves derived from other lines are affected by either distortions of the primary or circumstellar material. We find no evidence for periods other than the orbital period, and we derive a 3 σ upper limit on changes in the orbital period, Pdot/P < 3 × 10-5 yr-1.

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