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The most oxygen-poor planetary nebula: AGB nucleosynthesis at low metallicities

  • G. Stasińska (a1), C. Morisset (a2), G. Tovmassian (a2), T. Rauch (a3) and T. Decressin (a4)...

Abstract

TS01 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.

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References

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