Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...475..812m&link_type=abstract
Astrophysical Journal v.475, p.812
Astronomy and Astrophysics
Astronomy
49
Stars: Binaries: Eclipsing, Stars: Novae, Cataclysmic Variables, Stars: Individual Constellation Name: Ht Cassiopeiae, X-Rays: Stars
Scientific paper
We report on a 1 day ASCA observation and ROSAT HRI observations of the eclipsing dwarf nova HT Cas. The presence of the X-ray eclipse, originally detected in a ROSAT PSPC observation, is confirmed at a much higher significance level. The quality of the ASCA light curve is high enough to allow detailed investigation of the eclipse depth, width, and shape. The eclipse is found to be deep, compatible with being total. The eclipse width is comparable to that of the white dwarf, as derived from optical light curves, and in fact may be narrower. The eclipse transition is also found to be short, which puts a limit of 1.15 times the white dwarf radius as the total size of the X-ray emission region. The out-of-eclipse spectrum of HT Cas is found to be consistent with a single temperature (kT ~ 10 keV), absorbed (NH ~ 3.3 x 1021 cm-2), thermal model.
Mukai Koji
Naylor Tim
Schlegel Eric M.
Swank Jean H.
Wood Janet H.
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