Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.1518s&link_type=abstract
American Astronomical Society, HEAD meeting #4, #15.18; Bulletin of the American Astronomical Society, Vol. 31, p.714
Astronomy and Astrophysics
Astronomy
Scientific paper
LMC X-4 is a high mass X-ray binary system with a 13.5 sec period accreting pulsar in a 1.4 day orbit. The system displays a super-orbital cycle of X-ray intensity variations repeating every 30.5 days consisting of alternating high and low X-ray flux state. This phenomenon is believed to be caused by a tilted, precessing accretion disk similar to that in Her X-1. We present results of a study of the 30.5 day ``long'' cycle of LMC X-4 using RXTE observations. The 30.5 day cycle was surveyed with a series of RXTE pointings. We present the resulting lightcurve and compare it to the average lightcurve obtained from the RXTE All-Sky Monitor. We show color-color and color-intensity plots as well as representative spectra. The pulse profile evolution across the single High state of LMC X-4 is shown. There is no evidence for a second weaker high state in LMC X-4 unlike that in Her X-1. We compare the properties of the long cycle in LMC X-4 with those in Her X-1.
Leahy Denis
Scott Matthew
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