Detection of Fluorine in the Halo Planetary Nebula BoBn 1: Evidence For a Binary Progenitor Star

Abstract

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.

13 pages, 3 figures, accepted by ApJ Letters

References in corpus (5)

• Carbon Enhanced Metal-Poor Stars. I. Chemical Compositions of 26 Stars
• Stellar Models and Yields of Asymptotic Giant Branch Stars
• Fluorine in carbon-enhanced metal-poor stars: a binary scenario
• The impact of the 18F(a,p)21Ne reaction on asymptotic giant branch nucleosynthesis
• Carbon Rich Extremely Metal Poor Stars: Signatures of Population-III AGB stars in Binary Systems

Cited by in corpus (6)

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• Fluorine in the Solar neighborhood: No evidence for the neutrino process
• Fluorine in the solar neighborhood - is it all produced in AGB-stars?
• Chemical Abundances and Dust in the Halo Planetary Nebula K648 in M15: Its Origin and Evolution based on an Analysis of Multiwavelength Data
• Physical properties of the fluorine and neutron-capture element-rich PN Jonckheere 900