a Faint Neutron Star Soft X-Ray Transient Returning to Quiescence

Details a Faint Neutron Star Soft X-Ray Transient Returning to Quiescence a Faint Neutron Star Soft X-Ray Transient Returning to Quiescence

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1059j&link_type=abstract

Chandra Proposal ID #03408085

Physics

Chandra Proposal Id #03408085

Scientific paper

Approx 10 SXTs like SAXJ1808.4-3658 form a class of faint SXTs, calculations show that the NS magnetic field will not be buried in these systems. We propose to obtain three observations of a faint SXT as it returns to quiescence. Monitoring observations will allow us to observe the transition from a spectrally hard state in outburst to a soft spectral state in quiescence. To find out which emission mechanism is responsible for the low-level X-ray emission, it is crucial to get good 0.1-8 keV spectra and to identify at which luminosity the transition from hard to soft takes place. For this study the low N_H of this source is vital. Given a neutron star magnetic field strength, for lower mass accretion rates (unaccessible for RXTE) the magnetosphere will be larger and the polar caps onto which magnetically channelled matter accretes smaller, resulting in larger pulsed fractions. Observations with ACIS-S in CC mode will allow us to search for pulsations at frequencies less than 166 Hz.

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