Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536003l&link_type=abstract
American Astronomical Society, AAS Meeting #215, #360.03; Bulletin of the American Astronomical Society, Vol. 42, p.547
Astronomy and Astrophysics
Astronomy
Scientific paper
The well-studied X-ray binary Hercules X-1/HZ Her has a 1.7 day orbital period, a 1.24 second neutron star rotation period and a 35-day long X-ray cycle of high, low and short-high states. The cycle is caused by changing obscuration of the line-of-sight to the neutron star as the warped accretion disk precesses/rotates. Here we study the X-ray observations of Her X-1 over a period of more than 10 years taken with the All-Sky Monitor instrument of the Rossi X-ray Timing Explorer. We determine turn-on times and cycle lengths. This study contains the longest time period yet for analysis of the 35-day cycle. We discuss the new properties of the 35-day cycle that are found, including distributions of turn-on times and cycle lengths.
This worked funded by the Natural Sciences and Engineering Research Council of Canada.
Igna Ciprian
Leahy Denis A.
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