ASASSN-19fy:“周期间隙”中一颗矮新星的特征

Pub Date : 2023-07-29 DOI:10.1007/s10511-023-09783-1

O. I. Antonyuk, E. P. Pavlenko, K. A. Antonyuk, N. V. Pit, A. A. Sosnovskij, G. I. Kokhirova, F. D. Rakhmatullaeva

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引用次数: 0

摘要

2020-2021年，在俄罗斯科学院克里米亚天体物理天文台和塔吉克斯坦国家科学院天体物理研究所Sanglokh国际天文台对“周期间隙”中的矮新星ASASSN-19fy进行了24晚和3晚的光度研究。观测包括一次超突，两次连续的再亮，以及缓慢地恢复到突前(静止)状态。在此期间，观测到了超级驼峰，在其演化过程中，确定了发达的超级驼峰“B”阶段，它们的阻尼“C”阶段以及它们之间的过渡阶段。B期超峰期平均为0.09278(13)d，呈(dP / dT) / P = 10·10 - 5的速率增加。在“C”阶段，超级峰期为0.092289(15)天。结果表明，ASASSN-19fy是第12个加入类似WZ型星的长周期矮新星群的天体。

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

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 damping “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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