Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91...97s&link_type=abstract
Astronomy and Astrophysics, vol. 91, no. 1-2, Nov. 1980, p. 97-107. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
18
Binary Stars, Linear Polarization, Stellar Envelopes, Stellar Models, X Ray Sources, X Ray Stars, Curve Fitting, Data Smoothing, Stellar Spectrophotometry
Scientific paper
An analytical method for determining the effect of data noise on the evaluation of models for binary star systems from their linear polarimetric variability was applied to Cyg X-1. The method makes it possible to fit the constrained optimum to the data using parameters of a canonical model for polarimetric binaries. The model provides a chi square value acceptable at the 10% significance level for inclinations in the 85 to 150 deg range; the spectrophotometrically determined inclination of Cyg X-1 of 30 deg is within the 90% confidence interval when applied to noisy polarimetric measurements. The best fit value of other canonical model parameters shows that the scattering envelope mass is at least 10 to the 24th g, which is comparable to the mass accretion per orbital period required to fuel the X-ray source.
Aspin Colin
Brown John C.
Simmons John F. L.
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