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The Orbital Period of HDE226868/Cyg X-1 | | J. LaSala
; P.A. Charles
; R.A.D. Smith
; M. Balucinska-Church
; M.J. Church
; | | Date: |
4 Dec 1998 | | Journal: | M.N.R.A.S. vol. 301, p. 285 (1998) | | Subject: | astro-ph | | Affiliation: | 1,2), P.A. Charles, R.A.D. Smith, M. Balucinska-Church and M.J. Church (Department of Astrophysics, University of Oxford, U.K.; University of Southern Maine, Physics Department, Portland,Maine, U.S.A.; School of Physics and Astronomy, University of B | | Abstract: | We present epoch 1996, high-quality radial velocity data for HDE 226868, the optical counterpart of Cygnus X-1. Combining our results with all published historical data, we have derived a new ephemeris for the system of HJD2450235.29 + n x 5.5998, which allows accurate orbital phase calculations to be made for any X-ray observations over the last 30 years. We find no evidence for any period change as has been suggested by Ninkov, Walker & Yang (1987). We discuss the shortcomings of previous work in establishing the period and orbital elements. | | Source: | arXiv, astro-ph/9812101 | | Services: | Forum | Review | PDF | Favorites | |
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