FG Sge: New Multicolor Photometry and Short-Term Dust Shell Clearing in 2019

Arkhipova1, V.P.; Ikonnikova, N.P.; Shenavrin, V.I.; Burlak, M.A.; Tatarnikov, A.M.; Tsvetkov, D.Y.; Belinskii, A.A.; Pavlyuk, N.N.; Shugarov, S.Y.

Авторы: Arkhipova1 V.P., Ikonnikova N.P., Shenavrin V.I., Burlak M.A., Tatarnikov A.M., Tsvetkov D.Yu, Belinskii A.A., Pavlyuk N.N., Shugarov S.Yu
Журнал: Astronomy Letters
Том: 48
Номер: 6
Год издания: 2022
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 329
Последняя страница: 344
DOI: 10.1134/S1063773722060019
Аннотация: We present the results of a new stage of the long-term photometric study of FG Sge which is a quickly evolving central star of the planetary nebula Hen 1-5. Our new observations carried out on the SAI MSU telescopes in the optical (BVRcIc) and infrared (IR) (JHKLM) regions in 2008–2021 and2013–2021, respectively, allowed us to trace the evolution of the star’s brightness in recent years. The most significant observations were performed in 2019 when the star suffered a short clearing of the dust shell and became visible in BVRc. Based on the spectral energy distribution of FG Sge in the 0.4–5 μm wavelength range we derived the dust shell parameters: the size of dust grains a = 0.01 μm, the inner radius temperature T_dust = 900 K, optical depth τ(K) = 0.5 (τ(V) = 4.5), the total mass of dust M_dust = 7 x 10^{−5}M_Sun. After the short-term clearing of the dust shell in 2019, another dust structure was ejected that resulted in the star fading in all the observed bands. Based on the IR brightness and color curves, we estimated the dust depthgrowth in 2019–2020.
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FG Sge: New Multicolor Photometry and Short-Term Dust Shell Clearing in 2019статья

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