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.
Cite
@article{arxiv.1109.1519,
title = {A barium-rich binary central star in Abell 70},
author = {Henri M. J. Boffin and B. Miszalski and D. J. Frew and A. Acker and J. Köppen and A. F. J. Moffat and Q. A. Parker},
journal= {arXiv preprint arXiv:1109.1519},
year = {2015}
}
Comments
To be published in IAU Symp. 283: Planetary Nebulae, an Eye to the Future; 2 pages