UBV photometry of dwarf novae during the rise to maximum shows, in all cases, U-B colors that are substantially redder than at any other stage. The dwarf nova thus follows a loop in the two-color plane which can be plotted in detail for SS Cyg and VW Hyi. This effect can be understood in terms of the accretion model of dwarf nova outbursts.
CITATION STYLE
Bailey, J. (1980). Colour variations during dwarf nova outbursts. Monthly Notices of the Royal Astronomical Society, 190(2), 119–123. https://doi.org/10.1093/mnras/190.2.119
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