Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.253...27b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 253, Nov. 1, 1991, p. 27-34.
Astronomy and Astrophysics
Astronomy
59
Cataclysmic Variables, Eclipsing Binary Stars, Light Curve, White Dwarf Stars, Circular Polarization, Stellar Luminosity, Stellar Mass Accretion, Stellar Models, Stellar Spectrophotometry
Scientific paper
CCD high-speed photometric observations of the eclipse light curves of the AM Herculis binary UZ For (EXO 033319-2554.2) are presented. Circular polarization observations at lower time resolution, covering the whole binary cycle are presented. The eclipse light curves are clearly resolved into two components which can be identified with the white dwarf photosphere, and the accretion spot on its surface. This provides a particularly direct confirmation of the standard model of AM Herculis systems. The eclipse light curve is modeled in order to set constraints on the geometrical parameters of the binary system, and the location of the accretion spot. The duration of the ingress and egress of the white dwarf eclipse constrains the radius and hence mass of the white dwarf. It is found that the white dwarf mass is between 0.61 and 0.79 solar mass. The accretion spot is found to have a radius of about 0.12 times the radius of the white dwarfs.
Bailey Jeremy
Cropper Mark
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