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R. E. Shirey (University of California, Santa Barbara)
We present results from two recent coordinated XMM-Newton/RXTE observations of the unusual LMXB Circinus X-1. Almost all of the first observation occurred during a very long (7 hr) absorption dip, while the second occurred while the source was in a much brighter (flaring) state. We compare spectra from these two states obtained with the EPIC-PN camera and the Reflection Grating Spectrometers on XMM. For example, the absorption-dip spectra show very prominent Fe K-alpha lines from different ionization species, while the lines are not apparent in the bright-state spectra.
The author(s) of this abstract have provided an email address for comments about the abstract: shirey@xmmom.physics.ucsb.edu