A Search for Photometric and Spectroscopic Evolutionary Changes in the Young Planetary Nebula Vy 2-2

Arkhipova, V.P.; Burlak, M.A.; Esipov, V.F.; Ikonnikova, N.P.; Komissarova, G.V.

Авторы: Arkhipova V.P., Burlak M.A., Esipov V.F., Ikonnikova N.P., Komissarova G.V.
Журнал: Astronomy Letters
Том: 43
Номер: 12
Год издания: 2017
Издательство: Maik Nauka/Interperiodica Publishing
Местоположение издательства: Russian Federation
Первая страница: 831
Последняя страница: 843
DOI: 10.1134/S1063773717110019
Аннотация: The results of long-term photometric and spectroscopic observations of the young compact planetary nebula Vy 2-2 (PNG 045.4-02.7) are presented. The UBV photometry in 1990–2016 has revealed a slight brightness trend in the yearly averaged data, most pronounced in the V band. We have measured the relative fluxes of optical emission lines on the spectrograms taken with the 1.25-m telescope at the Southern Station of the SAI MSU in 1999–2016, estimated the absolute flux in the Hβ line to be F(Hβ) = (2.1 ± 0.4) × 10−12 erg cm−2 s−1, and determined the interstellar extinction constant c(Hβ) = 1.8. The electron temperature and density in the nebula have been estimated from diagnostic line ratios: Te = (10−12) × 103 K and Ne ≥ 105 cm−3. To detect any possible evolutionary changes, we have compared the new observations with the archival data obtained over the entire history of spectroscopic observations of Vy 2-2. No significant changes in the relative intensities of the strongest emission lines and the integrated flux in the Hβ line exceeding the observational errors have been found. We have revealed a tendency for the intensity ratio F(λ4363)/F(λ4959) to decrease with time, which may be related to a decrease in the electron density in the nebula. Based on our photometric and spectroscopic data, we have estimated the luminosity of the central star of Vy 2-2, which corresponds to the evolutionary tracks for the most massive post-AGB stars of the O-rich sequence.
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A Search for Photometric and Spectroscopic Evolutionary Changes in the Young Planetary Nebula Vy 2-2статья

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