Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aca....54..433s&link_type=abstract
Acta Astronomica, v.54, pp. 433-442, (2004).
Other
16
Stars: Dwarf Novae, Novae, Cataclysmic Variables, Stars: Individual: U Gem
Scientific paper
Superhumps are detected in the AAVSO light curve of the 1985 superoutbursts of U Gem. They appeared not later than 2-3 days after reaching maximum and disappeared not later than about 4days before the final decline. The superhump period was P_sh approx 0.20 d and increased at a rate of dP/dt approx 2x10^-4. The corresponding superhump period excess was epsilon = 0.130 +/- 0.014. The full amplitude of the superhumps was 2A approx 0.3 mag.
During the last ten days of the superoutburst additional periodic variations were also present. Their period was approx 0.18 d and their full amplitude grew from 2A approx 0.2 mag to approx 0.5 mag.
U Gem, together with the permanent superhumper TV Col (Retter et al 2003), form a challenge to the theory which is unable to explain superoutburst and superhumps in systems with long orbital periods and mass ratios q>q_crit=1/3. Another challenge to the theory comes from a comparison of the theoretical epsilon-q relation resulting from numerical simulations (Murray 2000) with its observational counterpart: for q>0.15 the model values of epsilon are systematically - by a factor of 2 - too large.
Smak Jozef
Waagen Elizabeth O.
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