Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1416c&link_type=abstract
Chandra Proposal ID #05400034
Physics
Chandra Proposal Id #05400034
Scientific paper
Optical observations demonstrate that the low mass X-ray binary 4U 1957+11 is a nearly edge-on source. The changing morphology of the optical lightcurve, along with long term (hundreds of days) quasi-periods detected in the X-ray, strongly suggest that 4U 1957+11 exhibits a warped, precessing accretion disk and/or a wind-driven limit cycle. We will use Chandra-HETG to search for signatures of a photoionized atmosphere, determine whether any such atmosphere constitutes a wind sufficiently strong to lead to the observed super-orbital optical and X-ray variability, and study the elemental abundances and structure of the nearly edge-on disk. We are requesting a 67 ksec observation with HETG, i.e., two full binary periods of this potential black hole binary system.
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