Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nucleosynthesis during the Merger of White Dwarfs and the Origin of R
  Coronae Borealis Stars   Many hydrogen deficient stars are characterised 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_sol helium white dwarf with a
0.8 M_sol 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.

31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
15
The categories of this paper are: nucl-ex