Periodic timing residuals in pulsating binary X-ray sources and orbital precession in Hercules X-1

Details Periodic timing residuals in pulsating binary X-ray sources and orbital precession in Hercules X-1 Periodic timing residuals in pulsating binary X-ray sources and orbital precession in Hercules X-1

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222l.113a&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 222, June 15, 1978, p. L113-L117. Research supported by the United S

Astronomy and Astrophysics

Astrophysics

2

Binary Stars, Precession, Pulsars, Stellar Motions, X Ray Sources, Periodic Variations, Stellar Mass Accretion, Time Lag, X Ray Stars

Scientific paper

Intrinsic variations of pulse frequency and reflection of pulses produce systematic residuals in pulse arrival times from pulsating binary X-ray sources. An iterative technique is used to calculate higher-order terms in the arrival-time curve of a variable-frequency binary source. A general framework is also formulated for studying time delays caused by reflection of pulses. By applying these methods to Her X-1, it is found that reflection effects and variations in pulse frequency due to accretion torques, stellar wobble, and changes in pulse shape can mimic the effects of orbital precession with the 35-day period. Observational tests are suggested to resolve this ambiguity in the interpretation of the timing data.

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