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ASASSN-19fy: Features of a Dwarf Nova in the “Period Gap”

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Photometric studies of the dwarf nova ASASSN-19fy in the “period gap” were carried out in 2020-2021 over 24 nights at the Crimean Astrophysical Observatory of the Russian Academy of Sciences and 3 nights at the Sanglokh International Astronomical Observatory of the Institute of Astrophysics, National Academy of Sciences of Tajikistan. The observations covered a superoutburst, two successive rebrightenings, and a slow return to the pre-outburst (quiescent) state. During this time, superhumps were observed, in the evolution of which the stages of developed superhumps “B,” their dam** “C,” and a transition between them were identified. The average period of the superhumps in stage “B” was 0.09278(13) days and it was found its increase during this stage at a rate of (dP / dT) / P = 10·10–5. In stage “C” the period of the superhumps was equal to 0.092289(15) days. It is shown that ASASSN-19fy is the twelfth object to join the group of long-period dwarf novae similar to WZ Sge-type stars.

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Authors and Affiliations

  1. Crimean Astrophysical Observatory, Russian Academy of Sciences, Crimea, Russia

    O. I. Antonyuk, E. P. Pavlenko, K. A. Antonyuk, N. V. Pit & A. A. Sosnovskij

  2. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnij Arkhyz, Russia

    K. A. Antonyuk

  3. Institute of Astrophysics, National Academy of Sciences of Tajikistan, Dushanbe, Republic of Tajikistan

    G. I. Kokhirova & F. D. Rakhmatullaeva

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  1. O. I. Antonyuk
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  2. E. P. Pavlenko
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  3. K. A. Antonyuk
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  4. N. V. Pit
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  5. A. A. Sosnovskij
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  6. G. I. Kokhirova
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  7. F. D. Rakhmatullaeva
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Correspondence to E. P. Pavlenko.

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Translated from Astrofizika, Vol. 66, No. 2, pp. 233-244 (May 2023)

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Antonyuk, O.I., Pavlenko, E.P., Antonyuk, K.A. et al. ASASSN-19fy: Features of a Dwarf Nova in the “Period Gap”. Astrophysics 66, 213–223 (2023). https://doi.org/10.1007/s10511-023-09783-1

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  • DOI: https://doi.org/10.1007/s10511-023-09783-1

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