Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Detection of Fluorine in the Halo Planetary Nebula BoBn 1: Evidence For
  a Binary Progenitor Star   We have found the fluorine lines [F IV] 3996.92A,4059.90A in the extremely
metal-poor ([Ar/H] = -2.10+/-0.21) halo planetary nebula (PN) BoBn 1 in
high-dispersion spectra from the 8.2-m VLT/UVES archive. Chemical abundance
analysis shows that the fluorine abundance is [F/H] = +1.06+/-0.08, making BoBn
1 the most fluorine-enhanced and metal-poor PN among fluorine-detected PNe and
providing new evidence that fluorine is enhanced by nucleosynthesis in low mass
metal-poor stars. A comparison with the abundances of carbon-enhanced
metal-poor (CEMP) stars suggests that BoBn 1 shares their origin and evolution
with CEMP-s stars such as HE1305+0132. BoBn 1 might have evolved from a binary
consisting of ~2 Msun primary and ~0.8 Msun secondary stars.

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The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: nucl-ex
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The categories of this paper are: funct-an
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The categories of this paper are: quant-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con