期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 737, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/737/2/L34
关键词
nuclear reactions, nucleosynthesis, abundances; stars: AGB and post-AGB; white dwarfs
资金
- E.U.
- ESF
- MICINN [EUI2009-04167, 04170]
- [AYA2010-15685]
- [AYA08-1839/ESP]
- [AYA2008- 04211-C02-01]
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-circle dot helium white dwarf with a 0.8 M-circle dot 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.
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