Other
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.552..399s&link_type=abstract
Proceedings of the 5th INTEGRAL Workshop on the INTEGRAL Universe (ESA SP-552). 16-20 February 2004, Munich, Germany. Scientific
Other
Scientific paper
The properties of the outburst behaviour of six soft X-ray transients (SXTs) with a neutron star (NS) accretor are analyzed using the ASM/RXTE ob- servations, with an impact on the observations with INTEGRAL and on the observing strategy. It is found that the individual outbursts in each NS SXT are dependent on each other because they display well-defined trends in the O - C diagrams for the outburst recurrence time TC. In most cases, there is no relation (or at most a weak) between the peak outburst intensity Imax and TC in a given SXT. Nev- ertheless, the NS SXTs with shorter TC tend to pos- sess more uniform Imax for the individual events. The mean TC in the NS SXTs analyzed here is 60 350 days, which means that up to 19 outbursts have been observed in some of them by ASM/RXTE and hence it can be expected that at least a similar number of events may be observed by INTEGRAL. Generally, the hardness (X-ray color) increases with the increasing intensity, Isum, if Isum exceeds some threshold, and the variations of the X-ray color be- tween 1.5 4 keV tend to follow Isum better than the color changes between 4 12 keV. It is also shown that hard X-ray spectral states in the early rise and late decline of outbursts can be particularly suitable for INTEGRAL. Aql X-1 is brighter than 17 mag(V ) during outburst and hence it cold be detected by OMC in co-added frames. Key words: Stars: neutron; binaries: close; binaries: general; Stars: circumstellar matter; X-rays: bina- ries.
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