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Long-Term Activity of a Little Known Dwarf Nova DT Octantis

Long-Term Activity of a Little Known Dwarf Nova DT Octantis 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, T Cso, and of the normal outbursts, T Cno, to be approximately 311 d and about 30 d, respectively. Although the length of T Cso 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 T Cso displays considerably larger changes on the longer timescales. They suggest a dominant trend of a decrease of T Cso 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Astrophysical Bulletin Springer Journals

Long-Term Activity of a Little Known Dwarf Nova DT Octantis

Astrophysical Bulletin , Volume 74 (4) – Dec 10, 2019

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References (1)

Publisher
Springer Journals
Copyright
Copyright © 2019 by Pleiades Publishing, Ltd.
Subject
Physics; Astronomy, Astrophysics and Cosmology
ISSN
1990-3413
eISSN
1990-3421
DOI
10.1134/S199034131904014X
Publisher site
See Article on Publisher Site

Abstract

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, T Cso, and of the normal outbursts, T Cno, to be approximately 311 d and about 30 d, respectively. Although the length of T Cso 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 T Cso displays considerably larger changes on the longer timescales. They suggest a dominant trend of a decrease of T Cso 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.

Journal

Astrophysical BulletinSpringer Journals

Published: Dec 10, 2019

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