CHAZSS: The Chandra HETGS Atoll/Z Spectroscopic Survey

Details CHAZSS: The Chandra HETGS Atoll/Z Spectroscopic Survey CHAZSS: The Chandra HETGS Atoll/Z Spectroscopic Survey

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.1940m&link_type=abstract

Chandra Proposal ID #07400810

Physics

Chandra Proposal Id #07400810

Scientific paper

High-res. X-ray spectroscopy of accretion-powered sources in the Chandra era has focused on black holes. Neutron stars with low magnetic fields - "Z" and "atoll" binaries - have largely been ignored and/or poorly observed at high resolution. We propose a survey of 6 "Z" and "atoll" neutron star binaries. In a total of only 300 ksec, we can observe each of the 6 sources in our sample twice, obtaining consistent, robust, and constraining spectra free from photon pile-up. High-res. spectroscopy will break degeneracies in X-ray timing-based models for the accretion flows in these systems, and provide new insights into both the origin of the "kHz" QPOs seen in these sources and the nature of the "Z" and "atoll" tracks they trace in color-color diagrams.

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