ASCA Observations of U Geminorum during Quiescence

Astronomy and Astrophysics – Astronomy

Scientific paper

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Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: U Geminorum, X-Rays: Stars

Scientific paper

ASCA observations of the dwarf nova U Gem separated by 3 weeks during a long quiescent interval show no noticeable differences in count rates nor in the relatively hard (7-10 keV) X-ray spectrum. However, there are orbital phase-dependent variations in the quiescent X-ray light curves, which are similar to the absorption dips previously reported during outburst and decline from outburst. The dips are only apparent at low energies, and the different structure of the light curves indicates changes in the absorbing material between the two observations. These results imply that the X-ray emission at quiescence must be confined to a small area and that absorbing material must be located at very stable positions far out from the orbital plane.

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