Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..332a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 332-341.
Astronomy and Astrophysics
Astrophysics
35
Pulsars, Variability, X Ray Binaries, X Ray Spectra, Exosat Satellite, Light Curve, Magellanic Clouds, Periodic Variations, Power Spectra, Spectrum Analysis, Stellar Mass Accretion
Scientific paper
Five Exosat observations made in October and November of 1984 are used to study the aperiodic X-ray variability of the X-ray pulsar SMC X-1. During the first observation, an X-ray burst was observed in which the source count rate increased by a factor of about 3 in less than 0.7 sec, and then decayed to the preburst level over the next 80 sec. The burst is not of the classical type, since it did not have a blackbody spectrum and no cooling occurred during the decay. A 35-percent decline in the persistent emission level was observed after the burst, suggesting that it was generated by an instability in the accretion flow. A power-spectrum analysis of the source light curves revealed the presence of aperiodic flux variations on a time scale from hours to tens of milliseconds. It is suggested that the burst is an extreme manifestation of the source variability on a time scale of about 100 sec.
Angelini Leonardo
Stella Luigi
White Nicholas E.
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