Long-term Walraven photometry of cataclysmic variables

Astronomy and Astrophysics – Astronomy

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Astronomical Photometry, Cataclysmic Variables, Stellar Mass Accretion, Accretion Disks, Brightness Distribution, Dwarf Novae, H Alpha Line, Long Term Effects, White Dwarf Stars

Scientific paper

Observations of cataclysmic variables obtained over the last seven years with the Walraven photometer of the 90-cm Dutch telescope at La Silla yield, in the case of strongly variable blue sources, simultaneous detections in five bandpasses extending from the visible through the UV. The results thus obtained to date encompass measurements of changes in the rotation periods of accreting white dwarfs in these variables, very strong upper limits to secular changes in the optical brightness of dwarf novae between outbursts, and the recognition that accretion instabilities similar to dwarf novae outbursts also occur in systems which are not thus classifiable.

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