Chandra HETG Observations of SS Cyg and U Gem in Quiescence and Outburst

Details Chandra HETG Observations of SS Cyg and U Gem in Quiescence and Outburst Chandra HETG Observations of SS Cyg and U Gem in Quiescence and Outburst

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1807m&link_type=abstract

American Astronomical Society, HEAD meeting #7, #18.07; Bulletin of the American Astronomical Society, Vol. 35, p.631

Astronomy and Astrophysics

Astronomy

Scientific paper

We targeted SS Cyg and U Gem in quiescence and outburst with the Chandra HETG to study the response of the boundary layer of nonmagnetic cataclysmic variables to changes in the mass-accretion rate. In all cases the hard X-ray spectra are adequately described by multi-temperature thermal plasmas, but when SS Cyg goes into outburst it becomes dimmer in hard X-rays and displays a dramatic shift in its relative line strengths (from predominately H- to predominately He-like lines), whereas when U Gem goes into outburst it becomes brighter in hard X-rays and displays only a minor shift in its relative line strengths. In both cases, the emission lines becomes significantly broader in outburst, signaling the presence of a broad range of either Kepler or expansion velocities.

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