1 research outputs found
Superhumps in a Peculiar SU UMa-Type Dwarf Nova ER Ursae Majoris
We report the photometry of a peculiar SU UMa-type dwarf nova - ER UMa for
ten nights during 1998 December and 1999 March covering a complete rise to the
supermaximum and a normal outburst cycle. Superhumps have been found during the
rise to the superoutburst. A negative superhump appeared in Dec.22 light curve,
while the superhump on the next night became positive and had large amplitude
and distinct waveform from that of the previous night. In the normal outburst
we captured, superhumps with larger or smaller amplitudes seem to always exist,
although it is not necessarily true for every normal outburst. These results
show great resemblance with V1159 Ori (Patterson et al. 1995). It is more
likely that superhumps occasionally exist at essentially all phases of the
eruption cycles of ER UMa stars, which should be considered in modeling.Comment: 4 pages, 5 figures, Accepted by ApJ Letter