An Improved Orbital Ephemeris for Cygnus X-1

Details An Improved Orbital Ephemeris for Cygnus X-1 An Improved Orbital Ephemeris for Cygnus X-1

1998-12-03

arxiv.org/abs/astro-ph/9812077v1

A&A, 343, 861

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A

Scientific paper

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.

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