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• W2106892786 abstract "The analysis of spectra of novae in the nebular stage shows that the absorption of ultraviolet radiation produced by a central source is the main mechanism of ionization of nova envelopes. The ionization and thermal equilibria are generally satisfied except the late nebular and post-nova stages when the recombination time is longer then one year. In the case when [OI] lines are observed in the spectrum of a nova, the envelope is expected to be optically thick in the Lyman continuum. Due to large overabundances of CNO elements observed in novae, the absorption of ionizing photons by these elements is important and must be taken into account in model calculations. A sequence of stationary photoionization models of the envelope of Nova Del 1967 in the nebular stage have been constructed. The results of calculations have been compared with spectroscopic observations of the nova made in June,1969 — August,1975. The observed intensities of emission lines cannot be entirely matched by the models of the envelope in which a single blackbody spectrum of the ionizing radiation is assumed; the computed intensities of [NeV], [OII], and [NII] lines are then 4–100 times smaller then the observed ones. After detailed discussion we have come to the conclusion that the ionizing radiation is probably produced by two sources with different temperatures. The observational data obtained in June-July, 1969 have been well matched by the models assuming that the ionizing radiation is a sum of two blackbody distributions with temperatures: ~2.5 x 105 K and ~4 x 104 K. The hotter spectrum is attributed to the hot atmosphere of the primary whereas the cooler one is probably produced by the heated secondary and/or the outburst remnent transformed into a differentially rotating disk. Finally, we discuss briefly the evolution of the envelope of Nova Del 1967 in the nebular and post-nova stages." @default.
• W2106892786 created "2016-06-24" @default.
• W2106892786 creator A5021059776 @default.
• W2106892786 date "1977-01-01" @default.
• W2106892786 modified "2023-10-17" @default.
• W2106892786 title "Problems of Ionization of Nova Envelopes in the Nebular Stage. The Models for Nova Delphini 1967" @default.
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• W2106892786 doi "https://doi.org/10.1007/978-94-010-1217-1_22" @default.
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