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

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

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..265...94s&link_type=abstract

Chemical Abundances in the Universe: Connecting First Stars to Planets, Proceedings of the International Astronomical Union, IAU

Astronomy and Astrophysics

Astronomy

Ism: Planetary Nebulae: Individual — Ism: Abundances — Stars: Agb And Post-Agb – Stars: Binaries

Scientific paper

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&sun;, 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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