Other
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd...6e..22s&link_type=abstract
Neutron Stars and Black Holes in Star Clusters, 26th meeting of the IAU, Joint Discussion 6, 17-18 August 2006, Prague, Czech Re
Other
Scientific paper
Soft X-ray transients (SXTs) represent a very important kind of X-ray binaries. Their activity is dominated by large-amplitude outbursts which are thought to be due to the thermal instability of the accretion disk embedding the compact object (neutron star (NS) or a black hole (BH)) (e.g. the model by Dubus et al. 2001). We present the results of analysis of the properties of the observed outburst behaviour and long-term activity of SXTs, using mainly the unprecedented ASM/ RXTE observations in the 1.5-12 keV passband. Among others, we pay large attention to the SXTs with the NS star accretor, Aql X-1 and 4U1608-52. We find that the individual outbursts in a given SXT analysed here are dependent on each other because they display well-defined trends in the O-C diagrams for the outburst recurrence time Tc. It emerges that the amount of matter, accreted onto the NS, largely differs from outburst to outburst, even if Tc remains almost constant. In some systems, Tc appears to be governed at a large extent by the redistribution of matter in the disk rather than by the amount of mass accreted from the disk onto the compact object during outburst. We argue that the observed activity of the ultra-compact system 4U1915-05 whose X-ray light curve is dominated by complicated variations in the form of rapidly recurring outbursts with a highly variable Tc (the periods persisting only for several epochs) can be explained if the disk oscillates between thermally stable and unstable state - we show that this atoll system thus represents an extreme case of SXT. On the outburst behaviour of the remarkable system KS1731-260 we show that the transition from a persistent X-ray source to quiescence (or even hibernation) goes through the outburst activity similar to SXTs but the state of the long-term activity of the "classical" SXTs is not the same as in KS1731-260.
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