CCD photometry of the first observed superoutburst of KP Cassiopeiae in 2008 October

Дата и время публикации : 2009-07-01T08:57:19Z

Авторы публикации и институты :
David Boyd
Pierre dePonthiere
Jerry Foote
Mack Julian
Taichi Kato
Robert Koff
Tom Krajci
Gary Poyner
Jeremy Shears
Bart Staels

Ссылка на журнал-издание: J.Br.Astron.Assoc. 120 (2010) 33-39
Коментарии к cтатье: Accepted for publication in the Journal of the British Astronomical Association, 14 pages, 7 figures
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: We report CCD photometry and analysis of the first observed superoutburst of the SU UMa-type dwarf nova KP Cassiopeiae during 2008 October. We observed a distinct shortening of the superhump period at superhump cycle 15. Before that point Psh was 0.08556(3) d and afterwards it evolved from 0.08517(2) d to 0.08544(3) d with a rate of period change dPsh/dt = 3.2(2) * 10-5. We measured the likely orbital period as 0.0814(4) d placing KP Cas just below the period gap. The superhump period excess is 0.048(5) and, empirically, the mass ratio q is 0.20(2). The superoutburst lasted between 8 and 12 days, peaked close to magnitude 13 with an amplitude above quiescence of 5 magnitudes, and faded for 4 days at a rate of 0.14 mag/d. Close monitoring following the end of the superoutburst detected a single normal outburst 60 days later which reached magnitude 14.7 and lasted less than 3 days.

Category: Physics