Variable Thermal Emission and Feature from AQL X-1 in Quiescence

Details Variable Thermal Emission and Feature from AQL X-1 in Quiescence Variable Thermal Emission and Feature from AQL X-1 in Quiescence

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1064r&link_type=abstract

Chandra Proposal ID #03408090

Physics

Chandra Proposal Id #03408090

Scientific paper

Aql X-1 went into outburst Feb 15 (ATEL 83) and was below 3 sigma detection in the 1-day ASM countrate on Mar 25. On Apr 1, it has been undetected with ASM for 7 days, which indicates it has returned to quiescence. We request observations to monitor the quiescent spectrum and intensity over 140 days, for 2 goals: (1) Long-term time-variability was observed between our 4 AO1 observations of Aql X-1. The variability may be secular, due to slow atmospheric-related processes, as opposed to stochastic processes like accretion-power. (2) Two important phenomena related to accretion were observed during only one (of the four) observations: short time-scale variability (32+8-6% rms, 1-10000 sec timescale) and a (time-variable) deficit of counts in the 0.45-0.6 keV band, where the first absorption feature due to metals in a NS atmosphere should occur. Multiple observations with the previous sensitivity can again detect variability and the deficit of counts in >1 observation.

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