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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
A barium central star binary in the Type I diamond ring planetary nebula Abell 70
Monthly Notices of the Royal Astronomical Society, Volume 419, No. 1, Year 2012
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Description
Abell 70 (PN G038.1-25.4, hereafter A 70) is a planetary nebula known for its diamond ring appearance due to a superposition with a background galaxy. The previously unstudied central star is found to be a binary consisting of a G8IV-V secondary at optical wavelengths and a hot white dwarf at ultraviolet wavelengths. The secondary shows Ba ii and Sr ii features enhanced for its spectral type that, combined with the chromospheric Hα emission and possible 20-30kms-1 radial velocity amplitude, firmly classifies the binary as a Barium star. The proposed origin of Barium stars is intimately linked to planetary nebulae (PNe) whereby wind accretion pollutes the companion with dredged-up material rich in carbon ands-process elements when the primary is experiencing thermal pulses on the asymptotic giant branch (AGB). A 70 provides further evidence for this scenario together with the other very few examples of Barium central stars. The nebula is found to have Type I chemical abundances with helium and nitrogen enrichment, which when combined with future abundance studies of the central star, will establish A 70 as a unique laboratory for studyings-process AGB nucleosynthesis. We also discuss guidelines to discover more binary central stars with cool secondaries in large orbits that are needed to balance our knowledge of binarity in PNe against the currently better studied post-common-envelope binary central stars. © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS.
Authors & Co-Authors
Miszalski, Brent
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Observatory
Southern African Large Telescope Foundation
United Kingdom, Hatfield
University of Hertfordshire
Boffin, Henri M.J.
Chile, Santiago
European Southern Observatory Santiago
Frew, David J.
Australia, Sydney
Macquarie University
Acker, Agnes̀s
France, Strasbourg
Université de Strasbourg
Köppen, Joachim
France, Strasbourg
Université de Strasbourg
France, Illkirch-graffenstaden
Isu International Space University
Germany, Kiel
Christian-albrechts-universität zu Kiel
Moffat, Anthony F.J.
Canada, Montreal
University of Montreal
Canada, Quebec
Centre de Recherche en Astrophysique du Québec
Parker, Quentin A.
Australia, Sydney
Macquarie University
Australia
Australian Astronomical Observatory
Statistics
Citations: 44
Authors: 7
Affiliations: 11
Identifiers
Doi:
10.1111/j.1365-2966.2011.19667.x
ISSN:
00358711
e-ISSN:
13652966
Research Areas
Environmental