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Títol:	Nucleosynthesis during the merger of white dwarfs and the origin of R Coronae Borealis stars
Autor/a:	Longland, Richard Leigh; Lorén Aguilar, Pablo; José Pont, Jordi; García-Berro Montilla, Enrique; Althaus, Leandro Gabriel; Isern Vilaboy, Jordi
Altres autors:	Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. Departament de Física Aplicada; Universitat Politècnica de Catalunya. GAA - Grup d'Astronomia i Astrofísica
Abstract:	Many hydrogen-deficient stars are characterized by surface abundance patterns that are hard to reconcile with conventional stellar evolution. Instead, it has been suggested that they may represent the result of a merger episode between a helium and a carbon–oxygen white dwarf. In this Letter, we present a nucleosynthesis study of the merger of a 0.4M helium white dwarf with a 0.8M carbon–oxygen white dwarf, by coupling the thermodynamic history of Smoothed Particle Hydrodynamics particles with a post-processing code. The resulting chemical abundance pattern, particularly for oxygen and fluorine, is in qualitative agreement with the observed abundances in R Coronae Borealis stars.
Abstract:	Peer Reviewed
Matèries:	-Àrees temàtiques de la UPC::Física::Astronomia i astrofísica::Cosmologia i cosmogonia -White dwarf stars -Asymptotic giant branch -AGB stars -Nanes blanques
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Tipus de document:	Article - Versió publicada Article
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