The most oxygen-poor planetary nebula: AGB nucleosynthesis at low metallicities
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Published:2009-08
Issue:S265
Volume:5
Page:94-97
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ISSN:1743-9213
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Container-title:Proceedings of the International Astronomical Union
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language:en
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Short-container-title:Proc. IAU
Author:
Stasińska G.,Morisset C.,Tovmassian G.,Rauch T.,Decressin T.
Abstract
AbstractTS01 is an exceptional planetary nebula (PN) in the Galactic halo: it is the most oxygen-poor and has a double-degenerate core with mass close to 1.4M⊙, possibly a Supernova Ia progenitor. With data from the far UV to the IR we can pin down the abundances of half a dozen of elements. The oxygen abundance is by 1.9(±0.3) dex lower than in the Sun. Standard AGB models with appropriate mass and metallicity cannot explain the observed chemical composition. We find that additional mixing, induced by stellar rotation and/or by the presence of the close companion can explain most of the features of the abundance pattern in TS01.
Publisher
Cambridge University Press (CUP)
Subject
Astronomy and Astrophysics,Space and Planetary Science