HT Cas: A Rare Outburst in February

On February 5, the eclipsing SU UMa-type dwarf nova HT Cas experienced a rare outburst as reported to be 13.6mag by P. A. Dubovsky (vsnet-campaign-dn 2095, vsnet-campaign-htcas 2, vsnet-campaign-news 132). The Kyoto team performed time-series observations and detected 1.0mag eclipses without clear superhumps (vsnet-campaign-dn 2097, vsnet-campaign-htcas 5, 6, 8). T. Vanmunster also performed time-series photometry of an eclipse and reported that no clear humps were seen (vsnet-campaign-dn 2098, 2099). J. Pietz then detected 1.2-mag eclipse (vsnet-campaign-dn 2100). A subsequent observation by T. Krajci showed a 1.5-mag eclipse, which suggested that the luminous part of the accretion disk was shrinking (vsnet-campaign-dn 2103). The outburst lasted until the late February 7, and then faded (vsnet-campaign-dn 2101, 2104, vsnet-campaign-htcas 3, 4, 7, 9, 11, 13, 16, 17). During the fading phase, T. Krajci reported 0.2 magnitude oscillations (vsnet-campaign-htcas 12), which T. Kato suggested to be orbital humps (vsnet-campaign-htcas 14). E. Pavlenko reported that the object remained relatively bright state on February 10 after the rapid fading from the last outburst. She also reported a hump just after an eclipse (vsnet-campaign-htcas 19, 20). The object was then very gradually fading as reported by M. Uemura and T. Krajci on February 12 (vsnet-campaign-htcas 21, 22). No major rebrightening was reported (vsnet-campaign-htcas 24). The object remained at the relatively bright state (16.0mag) compared with its quiescent magnitude over one week (vsnet-campaign-htcas 25).

Other articles:
vsnet-campaign 1287, vsnet-campaign-htcas 23

Link:

Time-series photometry taken by T. Krajci, see [vsnet-campaign-htcas 18]

Light curve taken by T. Vanmunster:
http://www.lunarpages.com/cbabelgium
[vsnet-campaign-dn 2098]

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