Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..292m&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 3, July 1980, p. 292-298.
Astronomy and Astrophysics
Astronomy
68
Binary Stars, Stellar Mass Ejection, Stellar Models, X Ray Sources, X Ray Stars, Absorption Spectra, Eccentricity, Light Curve, Mass Transfer, Radio Astronomy, Radio Emission, Stellar Motions, Stellar Spectra, Stellar Winds, X Ray Spectra
Scientific paper
A binary star model is used to account for the 16.59-d flaring behavior of the X-ray emission from Circinus X-1. The orbital eccentricity of 0.8 + or - 0.1 is derived from the X-ray light curve by assuming that the sharp X-ray cut-off every 16.59-d is a result of bound-free absorption in the primary star's stellar wind. The shape of the light curve has changed over the last eight years, and this is interpreted as due to orbital precession of the binary system. Simultaneous radio and X-ray observations of the flare from Circinus X-1 on February 1-5, 1978 are reported. These are accounted for within the framework of the model. The radio observations at 5 GHz are used independently to derive a high value of the orbital eccentricity (e = 0.7).
Haynes Raymond F.
Holt Stephen S.
Jauncey David L.
Kaluzienski L. J.
Lerche Ian
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