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标题：The First Nova Explosions
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作者：J. José ; M. Hernanz ; E. García-Berro,P.,Gil-Pons 等
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2006
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：Classical nova outbursts are powered by thermonuclear runaways (hereafter, TNRs) that take place in the hydrogen-rich accreted envelopes of white dwarf stars in close binary systems. Extensive numerical simulations of nova outbursts have shown that the accreted envelopes reach peak temperatures ranging between 100 and 400 MK, for about several hundred seconds, and therefore, their ejecta is expected to show signatures of a significant nuclear activity. Indeed, it has been claimed that novae can play a certain role in the enrichment of the interstellar medium through a number of intermediate-mass elements. This includes 17O, 15N, and 13C, systematically overproduced in huge amounts with respect to solar abundances, with a lower contribution in a number of other species with A < 40, such as 7Li, 19F, or 26Al. Estimates of the contribution of novae to the Galactic abundances usually rely on poorly known quantities, and implicitly assume that novae have been the same sort of objects during the whole Galaxy's history. In this paper, we review our understanding of classical novae and outline our current strategies to simulate primordial (Population III) nova outbursts.