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arxiv: 1109.1519 · v1 · submitted 2011-09-07 · 🌌 astro-ph.GA

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A barium-rich binary central star in Abell 70

Henri M. J. Boffin , B. Miszalski , D. J. Frew , A. Acker , J. K\"oppen , A. F. J. Moffat , Q. A. Parker
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classification 🌌 astro-ph.GA
keywords starcentralabellbinaryfoundsecondaryabundanceabundances
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We have found the central star of Abell 70 (PN G038.1-25.4, hereafter A 70) to be a binary consisting of a G8 IV-V secondary and a hot white dwarf. The secondary shows enhanced Ba II and Sr II features, firmly classifying it as a barium star. The nebula is found to have Type-I chemical abundances with helium and nitrogen enrichment, which combined with future abundance studies of the central star, will establish A 70 as a unique laboratory for studying s-process AGB nucleosynthesis.

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