Solving the ``iron curtain conundrum''

Details Solving the ``iron curtain conundrum'' Solving the ``iron curtain conundrum''

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8130n&link_type=abstract

HST Proposal ID #8130

Physics

Hst Proposal Id #8130 Binary Stars

Scientific paper

X-ray observations of dwarf novae in quiescence, including OY Car, show deep and unmistakable X-ray eclipses, indicating that the boundary layer is directly observable. However, quiescent UV spectra of OY Car indicate the presence of veiling material, which has been modelled at a column density that would make it impossible to observe directly the boundary layer {Horne et al. 1994}. We propose to obtain phase resolved HST observations of OY Car in quiescence, simultaneous with ASCA X-ray observations, in order to resolve the apparent discrepancy between the X-ray and UV measurements of n_H. These observations will also enable us to investigate the azimuthal variation of the absorbing material.

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