A barium-rich binary central star in Abell 70

Details A barium-rich binary central star in Abell 70 A barium-rich binary central star in Abell 70

2011-09-07

arxiv.org/abs/1109.1519v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

To be published in IAU Symp. 283: Planetary Nebulae, an Eye to the Future; 2 pages

Scientific paper

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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