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Article overview
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An Improved Orbital Ephemeris for Cygnus X-1 | C. Brocksopp
; A.E. Tarasov
; V. M. Lyuty
; P. Roche
; | Date: |
3 Dec 1998 | Journal: | A&A, 343, 861 | Subject: | astro-ph | Affiliation: | U Sussex), A.E. Tarasov (CrAO, Ukraine), V. M. Lyuty (SAI, Russia), P. Roche (U Sussex | Abstract: | By accumulating all available radial velocity data and combining it with our own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357 Cygni/HDE226868). We initially calculate an orbital period of 5.599847+/-0.000018.days and then, by including the more recent radial velocities of LaSala et al. (1998) and Sowers et al.(1998) we refine this to 5.599829+/-0.000016 days. Using 27 years’ worth of photometry, we also calculate a photometric period of 5.599836+/-0.000024 - remarkably similar to the spectroscopic one. | Source: | arXiv, astro-ph/9812077 | Services: | Forum | Review | PDF | Favorites |
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