EF Peg : Rare superoutburst in October

On October 3, E. Muyllaert detected a nare outburst of the SU UMa-type dwarf nova EF Peg at 11.1mag. EF Peg is a strange SU UMa-type star in the point of its long cycle of superoutburst with a long orbital period of near 2 hours, the edge of the "period gap" of CVs (vsnet-campaign 1180). The light curve taken by D. Starkey on October 6 showed a probable superhump, which strongly indicates that it was a genuine superoutburst (vsnet-campaign-dn 1688). M. Uemura reported that the time-series data obtained at Kyoto clearly showed a growth of humps from amplitudes of ~0.07mag to ~0.13mag. The decline speed became slow with this growth of humps (vsnet-campaign-dn 1726). The object started a rapid fading from the superoutburst on October 20 as reported by Pavol A. Dubovsky (vsnet-campaign-dn 1762). M. Uemura performed period analysis using the data sets by the VSNET collaboration team (the Kyoto team, D. Starkey, and J. Pietz) and reported a period of 0.086509 (24) d. Early phase observations by D. Starkey showed a short period or double-peak profile of humps. The later phase data yields a slightly longer period of 0.086686 (34) d (vsnet-campaign-dn 1771). After the rapid decline phase, observations by the Kyoto team detected a possible rebrightening on October 24 (vsnet-campaign-dn 1791).

Other related articles: vsnet-campaign-dn 1674, 1676, 1678, 1682, 1685, 1690, 1693, 1696, 1701, 1707, 1715, 1722, 1730, 1733, 1736, 1738, 1740, 1748, 1752, 1785,

T. Kato "Photometry of the 1991 Superoutburst of EF Pegasi: Super-Quasi-Periodic Oscillations with Rapidly Decaying Periods"
vsnet-preprint 65

General Information on This Object