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Enhanced Mass Transfer in U Geminorum during its Outbursts and Superoutburst

Smak J.

Acta Astronomica

2005

Vol. 55, No. 3

315--320

The mass transfer rate in U Gem at quiescence, estimated to be M≈1.3-2.0×1016 g/s, is used to calculate the amount of mass ΔMtr transfered to the disk during quiescence. Light curves of U Gem are used to estimate the amounts of mass ΔMaccr accreted during its three types of outbursts. In the case of wide outbursts and the 1985 superoutburst ΔMaccr are much larger than ΔMtr, indicating significant enhancement in the mass transfer by a factor of f≈20-50. There is no evidence for comparable enhancement during narrow outbursts.