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An Improved Orbital Ephemeris for Cygnus X-1

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arxiv astro-ph/9812077 v1 pith:32ZIQWNF submitted 1998-12-03 astro-ph

C. Brocksopp (U Sussex) , A.E. Tarasov (CrAO , Ukraine) , V. M. Lyuty (SAI , Russia) , P. Roche (U Sussex) This is my paper · ORCID
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keywords calculatecygnusdaysephemerisimprovedorbitalperiodradial
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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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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. OpenAlex reports about 6 citations worldwide. Full citation record

  1. A cooler look at the environment of Cygnus X-1: Searching for dynamical interactions within cold molecular gas

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    CO maps of Cygnus X-1 reveal a spider-like molecular structure whose kinematics favor stellar-wind-driven feedback further sculpted by the binary's relativistic jets.

  2. Energy-Resolved Limits on Orbital X-ray Polarization Modulation in Cygnus X-1

    astro-ph.HE 2026-06 unverdicted novelty 5.0 of 10

    No orbital polarization modulation at P_orb or P_orb/2 is detected in combined IXPE data for Cygnus X-1, with 99% upper limits of 0.54-2.13% on P_orb/2 amplitude across 2-8 keV bands, consistent with sensitivity limits.

  3. The population of NuSTAR Black Hole X-ray Binaries

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    The observed spins of black holes in X-ray binaries are almost all high and can be described by a beta distribution with alpha=5.66 and beta=1.09, with spin precision improving for more massive, closer, and more incli...

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