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| Paper: |
Radial Pulsations in Nova Envelopes |
| Volume: |
135, A Half Century of Stellar Pulsation Interpretations: a Tribute to Arthur N. Cox |
| Page: |
116 |
| Authors: |
Schenker, K.; Gautschy, A. |
| Abstract: |
In search for the physical origin of the oscillatory phase in the declining part of the light curve of certain novae we study pulsations by means of a linear, radial, nonadiabatic stability analyses. Strong pulsational instabilities are found in envelopes, which are in thermal and hydrostatic equilibrium. During their outburst, classical novae evolve through a region on the Hertzsprung-Russell diagram which is known to be strongly unstable towards pulsations. Static models of nova envelopes, consisting of an isothermal CO-core plus an envelope with typical nova-like C- and O-enriched chemical composition, can only be constructed (and considered as reasonably good models) on small portions of the corresponding evolutionary paths. These regions belong either to low white-dwarf masses and/or to the final stage of hydrogen shell burning at very high effective temperatures. |
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