Long-term X-ray variability study of SMC X-1

Details Long-term X-ray variability study of SMC X-1 Long-term X-ray variability study of SMC X-1

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001esasp.459..333r&link_type=abstract

In: Exploring the gamma-ray universe. Proceedings of the Fourth INTEGRAL Workshop, 4-8 September 2000, Alicante, Spain. Editor:

Physics

4

X-Ray Binaries, Period Analysis, Wavelets

Scientific paper

We present a study of the long-term X-ray variability of the high mass X-ray binary SMC X-1 based on four and a half years of ASM/RXTE data. A decreasing period from ~60 to ~50 days using the first ~500 d of data was reported in the literature. Our analysis, based on the use of wavelets and standard techniques, shows that the period seems to be modulated in a regular way, decreasing from ~60 to ~45 d and increasing back later. The cycle of this modulation appears to be ~1421 d. Cyclic modulations of the long-term X-ray cyclic variations open new perspectives in the study of accretion in X-ray binaries.

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