Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..229d&link_type=abstract
Astrophysical Journal, Part 1, vol. 238, May 15, 1980, p. 229-237.
Astronomy and Astrophysics
Astrophysics
7
Atmospheric Composition, Cyano Compounds, Stellar Atmospheres, Stellar Envelopes, White Dwarf Stars, Abundance, Carbon, Hydrogen, Neon, Novae, Stellar Evolution, Stellar Structure
Scientific paper
The problem of obtaining a considerable carbon enhancement in nova envelopes to account for the occurrence of fast novae is examined in detail. No mechanism seems completely satisfactory from the points of view of stellar evolution and white dwarf structure, even considering evidence from single white dwarf observations. A further mechanism for carbon enhancement is proposed and its limits discussed in detail. The problem of neon enhancement in some novae is also considered and a qualitative explanation is found within the proposed scheme for carbon enhancement. It is suggested that sedimentation of carbon in the prenovae stage may influence the outburst modalities, thereby further enhancing the carbon abundance in the shell undergoing thermonuclear runaway.
Dantona F.
Mazzitelli Irene
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