What determines the speed class of novae

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Astrophysics, Binary Stars, Novae, Stellar Envelopes, Carbon, Nitrogen, Oxygen, Stellar Mass Accretion, White Dwarf Stars

Scientific paper

Recent theoretical hydrodynamic models show that novae of different speed classes can be obtained by varying the CNO enrichment and envelope mass. Recent observations seem to indicate that various degrees of CNO enrichment are found in the ejected shells of slow novae. A unified picture is proposed for novae of different speed classes as a combination of CNO enrichment and envelope mass. Several consequences of the scheme are discussed. The observational and theoretical results are explained in the context of the unified picture.

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