The early chemical evolution of nova outflows

Astronomy and Astrophysics – Astronomy

Scientific paper

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Novae, Cataclysmic Variables, Ism: Jets And Outflows, Ism: Molecules, Infrared: Stars

Scientific paper

The chemistry of the early stages of the evolution of a nova wind is examined. The new models include an extended chemistry and, in the light of current model atmosphere calculations, a careful treatment of the photoreactions. The results indicate that the chemistry may be somewhat richer than previously determined and, contrary to the findings of previous studies, is essentially not photon-dominated. The abundance of species such as CN and CO match observations well and the ratio of their abundances may be a useful density diagnostic. However, except at very early times, CO formation does not saturate; this has important implications for the subsequent dust-formation epoch. In particular it provides theoretical backing for those observations which suggest that carbon-rich and silicate dusts can be formed concurrently.

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