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Re-Evaluation of the Orbital Elements of HDE 226868 = Cyg X-1

Published online by Cambridge University Press:  14 August 2015

C. T. Bolton  and
Douglas R. Gies
C. T. Bolton
Affiliation:
David Dunlap Observatory, University of Toronto, P.O. Box 360, Richmond Hill, Ontario, CANADA L4C 4Y6
Douglas R. Gies
Affiliation:
David Dunlap Observatory, University of Toronto, P.O. Box 360, Richmond Hill, Ontario, CANADA L4C 4Y6

Extract

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We have scanned 75 high dispersion spectrograms of HDE 226868 = Cyg X-1 with the PDS microdensitometer of the David Dunlap Observatory in preparation for a detailed spectrophotometric study of the system. The plate material is identical to that described by Bolton (1972a,b,1975) and includes those plates. We have determined velocities for all of the spectrograms by fitting a parabola to the bottom of each line profile. The lines were divided into three groups, hydrogen lines, He I lines, and high excitation lines (He II, Si III and IV, N III), according to excitation, and separate mean velocities were determined for each group on each plate. We have computed the orbital elements of the system separately for each line group in order to look for differences caused by the effects of mass transfer or stellar wind.

Type
VI. X-Ray Binaries
Information
Symposium - International Astronomical Union , Volume 88: Close Binary Stars: Observations and Interpretation , 1980 , pp. 355 - 356
Copyright
Copyright © Reidel 1980 

References

Bolton, C.T.: 1972a, Nature , 235, 271.Google Scholar
Bolton, C.T.: 1972b, Nature Phys. Sci. , 240, 124.Google Scholar
Bolton, C.T.: 1975, Ap.J. , 200, 269.CrossRefGoogle Scholar