Studies of Long-Period Variability in the HMXB Systems LMC X-4 and SMC X-1

Details Studies of Long-Period Variability in the HMXB Systems LMC X-4 and SMC X-1 Studies of Long-Period Variability in the HMXB Systems LMC X-4 and SMC X-1

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..apr..d304k&link_type=abstract

American Physical Society, APS/AAPT Joint April Meeting, April 18-21, 1998 Columbus, Ohio, abstract #D3.04

Physics

Scientific paper

We present results from our Rossi X-Ray Timing Explorer (RXTE) long-term monitoring campaign of the X-ray pulsars LMC X-4 and SMC X-1. We have analyzed spectra spanning a little more than seven ~ 30-day cycles in LMC X-4 and nearly three ~ 50-day cycles in SMC X-1. While the results obtained for SMC X-1 are consistent with a simple model in which the modulation is due to absorption in a tilted accretion disk, the LMC X-4 spectra are not. If the long-term modulation were due solely to variable absorption, the column density should be highest when the flux is lowest. The hydrogen column density obtained for LMC X-4 during the low portion of its long-period cycle, however, is consistent with zero, with a 1 sigma upper limit of 1.5 x 10^21 cm-2. By the time of the meeting, we will have observations of five additional long-period cycles for LMC X-4 and a more mature analysis of the results.

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