Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-05-17
Astrophys.J. 612 (2004) 414-428
Astronomy and Astrophysics
Astrophysics
42 pages. Accepted for publication in The Astrophysical Journal
Scientific paper
10.1086/422569
Infrared and ultraviolet observations of nova light curves have confirmed grain formation in their expanding shells that are ejected into the interstellar medium by a thermonuclear runaway. In this paper, we present isotopic ratios of intermediate-mass elements up to silicon for the ejecta of CO and ONe novae, based on 20 hydrodynamic models of nova explosions. These theoretical estimates will help to properly identify nova grains in primitive meteorites. In addition, equilibrium condensation calculations are used to predict the types of grains that can be expected in the nova ejecta, providing some hints on the puzzling formation of C-rich dust in O>C environments. These results show that SiC grains can condense in ONe novae, in concert with an inferred (ONe) nova origin for several presolar SiC grains.
Amari Sachiko
Hernanz Margarita
Jose Jordi
Lodders Katharina
Zinner Ernst
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