The Structure of the Boundary Layer of U Geminorum in Outburst

Details The Structure of the Boundary Layer of U Geminorum in Outburst The Structure of the Boundary Layer of U Geminorum in Outburst

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1154m&link_type=abstract

Chandra Proposal ID #04300201

Physics

Chandra Proposal Id #04300201

Scientific paper

U Geminorum in outburst is an ideal laboratory in which to study the response of the boundary layer of nonmagnetic CVs to the ~3 order-of-magnitude increase in the mass-accretion rate of dwarf novae in outburst. Despite extensive observations in quiescence, U Gem has only infrequently been observed in the X-ray band in outburst, and never with "modern" (CCD, grating) instruments. We propose to remedy this situation by obtaining a TOO Chandra HETG spectroscopic observation of U Gem in outburst to determine the emission measure distribution, the velocity widths of the lines, the plasma density, the wavelength dependence of the dips in the light curves and the quasiperiodic oscillations, thereby providing constraints of the thermal, physical, and temporal structure of its boundary layer.

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