Precursor outbursts and superoutbursts in the SU UMa-type dwarf nova NN Camelopardalis

Дата и время публикации : 2010-09-09T10:16:33Z

Авторы публикации и институты :
Jeremy Shears
Jerry Foote
William Mack Julian
Tom Krajci
Igor Kudzej
Ian Miller
Etienne Morelle
Richard Sabo
Irina Solovyova
Bart Staels
Tonny Vanmunster

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 20 pages, 10 figures, accepted for publication in the Journal of the British Astronomical Association
Первичная категория: astro-ph.SR

Все категории : astro-ph.SR

Краткий обзор статьи: We report photometry of three outbursts of NN Cam in 2007, 2008 and 2009. The 2007 event started with a normal outburst, lasting about 4 days, which was a precursor to a superoutburst lasting at least 13 days. Both the precursor and the superoutburst had an amplitude of 4.9 mag above mean quiescence. Superhumps with a maximum peak-to-peak amplitude of 0.22 mag were detected during the superoutburst with a mean superhump period Psh = 0.07385(56) d. Psh decreased continuously with dPsh /dt = -1.72(23) x 10-3. We used our measurement to confirm that the shorter of two possible values of Porb reported by another researcher is the correct one, Porb = 0.0717 d. The 2008 outburst was rather poorly observed, although we present evidence that this too may have been a superoutburst. The 2009 event was also a superoutburst, with Psh = 0.07414(44) d, but we could find no evidence for a precursor. From the 2007 and 2009 data, we report a superhump period excess of epsilon = 0.030(8) to 0.034(6), which is typical for SU UMa dwarf novae of similar orbital period, and estimate the binary mass ratio q = Mwd/Msec $simeq$ 0.11 to 0.17

Category: Physics