Multiwavelength monitoring of the dwarf nova VW Hydri. II - Walraven photometry

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Dwarf Novae, Stellar Color, Stellar Spectrophotometry, Ubv Spectra, Ephemerides, Iue, Light Curve, Spectral Energy Distribution

Scientific paper

Five-color Walraven photometric observations of VW Hyi were obtained between July and November 1984. Significant orbital variations in the V-B, B-U, and B-L colors are detected which are mainly connected with the presence of an orbital hump. No evidence is found for a secular variation between outbursts in either the average flux or the orbital maximum and minimum fluxes, and little evidence is found for a secular trend in the shape of the orbital light curves between outbursts. The flux ratio across the Balmer jump is shown to change during a quiescence interval between outbursts, and results suggest a secular change in the shape of the B-U and U-W orbital color curves through quiescence. The onset of normal outbursts is found to be progressively delayed towards shorter wavelengths, in agreement with IUE observations.

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