Time-resolved IUE studies of cataclysmic variables. I - Eclipsing systems IP Peg, PG 1030+590, and V1315 AQL

Astronomy and Astrophysics – Astronomy

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Cataclysmic Variables, Eclipsing Binary Stars, Iue, Stellar Spectra, White Dwarf Stars, Emission Spectra, Stellar Oscillations, Ultraviolet Spectra

Scientific paper

IUE time-resolved spectra of the high-inclination cataclysmic variables IP Peg, PG 1030+590, and V1315 Aql are analyzed in order to determine the characteristics of the disks, hotspots, and white dwarfs. The UV continuum flux distributions are generally flatter than systems of low inclination and high mass-transfer rate, and the white dwarfs/inner disks appear to be relatively cool (15000 - 19000K) for their orbital periods, possibly because the boundary layers are blocked from view. The continuum fluxes increase at spot phases, with the spot providing the dominant flux in IP Peg. The spot temperatures range from hot (20000K) in IP Peg, and perhaps in PG 1030+590, to cool (11000K) in V1315 Aql. The C IV emission lines show slightly larger decreases at spot phases than during eclipse, which implies an extended stream area.

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