Half a century after the outburst of the symbiotic nova V1016 Cyg

Arkhipova, V.P.; Taranova, O.G.; Ikonnikova, N.P.; Esipov, V.F.; Komissarova, G.V.; Shenavrin, V.I.

Авторы: Arkhipova V.P., Taranova O.G., Ikonnikova N.P., Esipov V.F., Komissarova G.V., Shenavrin V.I.
Журнал: Baltic Astronomy
Том: 25
Год издания: 2016
Издательство: Institute of Theoretical Physics and Astronomy
Местоположение издательства: Lithuania
Первая страница: 35
Последняя страница: 41
Аннотация: We present the results of our long-term UBV JHKLM photometryand spectroscopic monitoring of the symbiotic nova V1016 Cyg. After its outburst in 1964, the star showed fading in the U, B, V bands at a rate of about0.03 mag per year. The behavior of the B-V and U-B color indices reflectsvariations of the emission lines, fading of the erupted component, weakeningand reddening of the cool giant. Also, monotonic color and brightness variations in the infrared (IR) were observed at a scale of several thousand days.After 2004, the yearly mean IR brightness showed a decline and IR colors, reddening, due to the increase of the optical depth of the dust. The parameters ofthe cool star and of the dust envelope were estimated. The pulsation period ofthe Mira-type variable was renewed, P = 465,5 days. The Mira's photospherictemperature varied from 2100 to 2700 K in the pulsation cycle. The mass ofthe dust shell has grown twice during the recent decade, at a dust penetration rate ΔMdust ~ 10^(−7)M⊙/yr. Our spectroscopic monitoring of V1016 Cyg over 1995-2013 showed variations in the emission line strengths. The absolutefluxes of most lines decreased after 2000, whereas the relative intensities of[O III], [Ar III], [Fe VII], [Ca VII] lines with respect to Halfa are increasing afterthe possible minimum that could happen in the 1990s. An essential flux decline (approximately ten-fold between 1995 and 2013) in the Raman scatteredOVI line at 6825 shows the change of conditions in its formation zone, due toabsorption of OVI 1032 quanta in the new dust shell of the cool component.
Добавил в систему: Таранова Ольга Георгиевна

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Half a century after the outburst of the symbiotic nova V1016 Cygстатья

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