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=1998aipc..431..421l&link_type=abstract

Accretion processes in astrophysical systems: Some like it hot! - eigth astrophysics conference. AIP Conference Proceedings, Vo

Astronomy and Astrophysics

Astrophysics

1

X-Ray Binaries, Pulsars, Accretion And Accretion Disks, X-Ray

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 five ~30-day cycles in LMC X-4 and nearly three ~60-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 1.5×1021 cm-2.

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