Pulse-timing observations of Hercules X-1

Details Pulse-timing observations of Hercules X-1 Pulse-timing observations of Hercules X-1

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247.1003d&link_type=abstract

Astrophysical Journal, Part 1, vol. 247, Aug. 1, 1981, p. 1003-1012.

Astronomy and Astrophysics

Astronomy

147

Eclipsing Binary Stars, Orbital Elements, Pulsars, Stellar Motions, X Ray Sources, Circular Orbits, Eccentricity, Spaceborne Astronomy, Stellar Spectrophotometry, Time Measurement

Scientific paper

Results are presented from pulse-timing analysis of Hercules X-1, based on satellite observations spanning 7 years. The binary orbital elements are redetermined and the near circularity of the orbit is confirmed with a new 2 sigma upper limit of 0.0003 on the eccentricity. We also report a much improved value of 1.70016779d + or - 0.00000001d for the orbital period, with a 2 sigma upper limit on its rate of change. Observations of transitions into and out of eclipse are used to determine an eclipse half-angle of 24.56 deg + or - 0.03 deg, somewhat smaller than previously reported values. The secular trend toward shorter pulse periods is found to be continuing.

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