Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...378..271h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 378, Sept. 1, 1991, p. 271-280.
Astronomy and Astrophysics
Astrophysics
60
Accretion Disks, Dwarf Novae, Eclipsing Binary Stars, Light Curve, White Dwarf Stars, Line Spectra, Stellar Models, Stellar Spectrophotometry
Scientific paper
The structure of HT Cas is investigated via optical eclipses. High-speed multicolor light curves covering four eclipses at UBR in September 1982 and 12 eclipses at UBVR in November-December 1983 are presented. From the latter, mean light curves are derived that cleanly separate the white dwarf and accretion disk eclipses. The bright spot is found to be weak or absent during the observations, but an 0.3 mag orbital modulation, centered on mideclipse, is seen on the U-band. A purely photometric model of the system is derived using contact timings of the white dwarf from the data presented and measurements of the bright spot eclipses in data published by Patterson (1981). Good internal consistency is found among the available constraints apart from the emission-line radial velocity curves, which are suspect because they are 30 deg out of phase with the eclipse.
Horne Keith
Stiening Rae F.
Wood Janet H.
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