Phase Resolved Spectroscopy of the X-Ray P-Cygni Profiles from Circinus X-1

Details Phase Resolved Spectroscopy of the X-Ray P-Cygni Profiles from Circinus X-1 Phase Resolved Spectroscopy of the X-Ray P-Cygni Profiles from Circinus X-1

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..574b&link_type=abstract

Chandra Proposal ID #02400153

Physics

Chandra Proposal Id #02400153

Scientific paper

In a Cycle 1 HETGS observation of the extremely luminous and violent X-ray binary Cir X-1, we have discovered many new X-ray emission lines showing broad P-Cygni profiles; these are from H-like and He-like ions of Ne, Mg, Si, S, Ar and Fe. The lines originate in a high-velocity (up to 2000 km/s) outflow, probably an accretion disk wind that is shielded by the outer disk bulge. The P-Cygni profiles are also likely related to the unusually broad, asymmetric H-alpha line observed from Cir X-1. We propose three 8 ks observations designed to measure the X-ray P-Cygni profiles at key phases of the 16.5-day orbital cycle and critically test our model for the origin of these remarkable lines. We expect line strength and profile variability due to changes in mass accretion rate and disk shielding.

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