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

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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, 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.

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Acknowledgments

This research has made use of the Dr. Remeis Observatory Bamberg Southern Patrol Photographic Sky Survey and the All Sky Automated Survey (ASAS) database. We acknowledge with thanks the variable star observations from the AAVSO International Database (Massachusetts, USA) contributed by observers worldwide and used in this research. We also acknowledge the use of the code Aperture Photometry Tool (APT), version 2.4.9.

Funding

This study was supported by the grant No. 17-05840S provided by the Grant Agency of the Czech Republic. Also support by the projects RVO:67985815 and D-25-CZ4/08-09 DAAD is acknowledged. H.E. acknowledges financial support by the German research foundation DFG under grant HE1356/63-2.

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Authors and Affiliations

  1. Astronomical Institute, The Czech Academy of Sciences, CZ-25165, Ondřejov, Czech Republic

    V. Šimon

  2. Faculty of Electrical Engineering, Czech Technical University in Prague, 16627, Prague, Czech Republic

    V. Šimon

  3. Dr. Karl Remeis-Sternwarte & ECAP, Astronomical Institute, Friedrich-Alexander University Erlangen-Nuremberg, 96049, Bamberg, Germany

    H. Edelmann

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  1. V. Šimon
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  2. H. Edelmann
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Correspondence to V. Šimon.

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The authors declare that they have no conflict of interest.

Russian Text © The Author(s), 2019, published in Astrofizicheskii Byulleten', 2019, Vol. 74, No. 4, pp. 507-514.

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Šimon, V., Edelmann, H. Long-Term Activity of a Little Known Dwarf Nova DT Octantis. Astrophys. Bull. 74, 490–496 (2019). https://doi.org/10.1134/S199034131904014X

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  • DOI: https://doi.org/10.1134/S199034131904014X

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