SMC X-1: Another tilted precessing accretion disk?

Details SMC X-1: Another tilted precessing accretion disk? SMC X-1: Another tilted precessing accretion disk?

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aipc..115..150g&link_type=abstract

AIP Conference Proceedings, Volume 115, pp. 150-153 (1984).

Physics

X-Ray Sources, X-Ray Bursts, X-Ray Binaries

Scientific paper

The 13-70 kev emission from the 0.7s X-ray pulsar SMC X-1 was monitored by the UCSD/MIT instrument aboard HEAO-1 during three ``80-day epochs in 1977 and 1978. The X-ray flux wandered slowly between a maximum value and unobservably small levels with a rough time scale of 60 days. This pattern resembles, but is less regular than, the ``1 month cycles of Her X-1 and LMC X-4, which are attributed to regular occulation by a tilted precessing accretion disk. Alternatively, the data also resemble band-limited red noise, which then would imply a highly variable accretion flow. There is no evidence for cyclotron lines in the spectrum.

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