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]