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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
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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2012

References

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