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A barium-rich binary central star in Abell 70

Published online by Cambridge University Press:  30 August 2012

Henri M. J. Boffin ,
Brent Miszalski ,
David J. Frew ,
Agnes Acker ,
Joachim Köppen ,
Anthony F. J. Moffat  and
Quentin A. Parker
Henri M. J. Boffin
Affiliation:
ESO, Santiago, Chile email: hboffin@eso.org
Brent Miszalski
Affiliation:
South African Astronomical Observatory and SALT
David J. Frew
Affiliation:
Macquarie University, Sydney, Australia
Agnes Acker
Affiliation:
Observatoire astronomique de Strasbourg, France
Joachim Köppen
Affiliation:
Observatoire astronomique de Strasbourg, France International Space University, Illkirch-Graffenstaden, France Universität Kiel, Germany
Anthony F. J. Moffat
Affiliation:
Universitéde Montréal, Québec, Canada
Quentin A. Parker
Affiliation:
Macquarie University, Sydney, Australia Australian Astronomical Observatory
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Abstract

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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.

Keywords

planetary nebulae: individual (PN G038.1–25.4)planetary nebulae: generalstars: chemically peculiarstars: AGB and post-AGBbinaries: generalbinaries: symbiotic
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S283: Planetary Nebulae: An Eye to the Future , July 2011 , pp. 314 - 315
Copyright
Copyright © International Astronomical Union 2012

References

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Miszalski, B., Boffin, H. M. J., Frew, D. J., et al. 2011, MNRAS, in press, arXiv:1108.3957Google Scholar