Long-Term Activity of a Little Known Dwarf Nova DT Octantis
- Авторлар: Šimon V.1,2, Edelmann H.3
-
Мекемелер:
- Astronomical Institute
- Faculty of Electrical Engineering
- Dr. Karl Remeis-Sternwarte & ECAP, Astronomical Institute
- Шығарылым: Том 74, № 4 (2019)
- Беттер: 490-496
- Бөлім: Article
- URL: https://journal-vniispk.ru/1990-3413/article/view/213026
- DOI: https://doi.org/10.1134/S199034131904014X
- ID: 213026
Дәйексөз келтіру
Аннотация
We analyze the long-term activity of a little known dwarf nova (DN) DT Oct. We use photographic observations from the Bamberg Observatory (Southern Patrol Photographic Sky Survey), CCD data from ASAS-3 survey, and AAVSO data (both CCD and visual). We determined the recurrence times of the superoutbursts, TCso, and of the normal outbursts, TCno, to be approximately 311 d and about 30 d, respectively. Although the length of TCso evolves gradually and undergoes only small variations (increases and decreases) of the nearby or neighbouring events (on the timescale of a few epochs), the evolution of TCso displays considerably larger changes on the longer timescales. They suggest a dominant trend of a decrease of TCso on the timescale of tens of years. The possibly magnetized white dwarf does not prevent DT Oct to show the long-term activity of the SU UMa systems. We place the time evolution of the superoutbursts of DT Oct in the context of DNe of various sub-types.
Авторлар туралы
V. Šimon
Astronomical Institute; Faculty of Electrical Engineering
Хат алмасуға жауапты Автор.
Email: simon@asu.cas.cz
Чехия, Ondřejov, CZ-25165; Prague, 16627
H. Edelmann
Dr. Karl Remeis-Sternwarte & ECAP, Astronomical Institute
Email: simon@asu.cas.cz
Германия, Bamberg, 96049
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