Spectroscopy of the optical component of Cygnus X-1

Details Spectroscopy of the optical component of Cygnus X-1 Spectroscopy of the optical component of Cygnus X-1

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sval....7..230a&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 7, July 1981, p. 417-421.) Soviet Astronomy Letters, vol. 7, July-Aug. 1981, p. 230-233

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, Binary Stars, Radial Velocity, Supergiant Stars, X Ray Sources, Absorption Spectra, Line Spectra, Stellar Magnitude, Stellar Mass

Scientific paper

Spectrograms taken with the 6-m telescope are used to investigate the optical component of the Cygnus X-1 binary system. Radial velocities are plotted for the lines of several elements, and the systematic residuals between Bolton's radial velocities and the present results vary insignificantly. The equivalent widths, central depths and differential shifts of the lines vary with orbital phase. The following parameters for the supergiant are obtained: spectral type, 09.55; effective temperature, 32,900 K; absolute bolometric magnitude, -9.47 m; and effective gravity, 3.07.

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