Nucleosynthesis during the merger of white dwarfs and the origin of R coronae borealis stars

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 pre...

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Detalles Bibliográficos
Autores: Longland, R., Lorén-Aguilar, P., José, J., García-Berro, E., Althaus, Leandro Gabriel, Isern, J.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2011
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/84192
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84192
Access Level:acceso abierto
Palabra clave:Ciencias Astronómicas
nuclear reactions, nucleosynthesis, abundances
stars: AGB and post-AGB
white dwarfs
Descripción
Sumario: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 0.4 M O helium white dwarf with a 0.8 M O 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.