Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...713..318l&link_type=abstract
The Astrophysical Journal, Volume 713, Issue 1, pp. 318-324 (2010).
Astronomy and Astrophysics
Astronomy
6
Stars: Individual: Her X-1 Hz Her, Stars: Neutron, X-Rays: Binaries
Scientific paper
The 35 day X-ray cycle of Hercules X-1 (Her X-1) has been the subject of intense study since its discovery over 30 years ago. This work summarizes the results of determination of 35 day cycle turn-on (TO) times based on Rossi X-Ray Timing Explorer (RXTE)/All-Sky Monitor (ASM) observations of Her X-1. We apply a cross-correlation method to the entire (RXTE/ASM) Her X-1 database acquired between 1996 February 20 and 2009 December 18. We obtain new TO times for 147 cycles, 94 of which have well-determined times. The results reveal a uniform distribution of TO times with orbital phase. This does not support previous results that suggest TO times cluster around a specific orbital phase, such as 0.2 or 0.7. We also find 35 day cycle lengths ranging from 33.2 days to 36.7 days, and an average cycle length of 34.7 days.
Igna Ciprian D.
Leahy Denis A.
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