Superhumps in Cataclysmic Binaries. XXII. 1RXS J232953.9+062814
Abstract
We report photometry of 1RXS J232953.9+062814, a recently discovered dwarf nova with a remarkably short 64.2-minute orbital period. In quiescence, the star's light curve is that of a double sinusoid, arising from the "ellipsoidal" distortion of the Roche-lobe-filling secondary. During superoutburst, common superhumps develop with a period 3-4% longer than Porb. This indicates a mass ratio M2/M1=0.19+-0.02, a surprisingly large value in so compact a binary. This implies that the secondary star has a density 2-3 times higher than that of other short-period dwarf novae, suggesting a secondary enriched by H-burning prior to the common-envelope phase of evolution. We estimate i=50+-5 deg, M1=0.63 (+0.12, -0.09) Msol, M2=0.12 (+0.03, -0.02) Msol, R2=0.121 (+0.010, -0.007) Rsol, and a distance to the binary of 180+-40 pc.
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