Infrared and optical light curves of EX Hydrae and VW Hydri

Astronomy and Astrophysics – Astronomy

Scientific paper

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Dwarf Stars, Infrared Astronomy, Light Curve, Novae, Stellar Radiation, Stellar Spectrophotometry, Astronomical Photometry, Optical Thickness, Ultraviolet Spectra, Visual Observation, X Ray Spectra

Scientific paper

The IR light curves of a number of dwarf novae have been observed during the past 18 months. The paper presents the light curves of EX Hya (V and K) and VW Hyi (J and K) at 1.2 and 2.2 microns, since both systems have very short periods and are believed to contain secondary stars which are virtually invisible at longer wavelengths. The IR colors imply very large disks for these systems. It is also found for EX Hya that the structure of the light curves is nonrepeatable.

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