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Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios

R. De Nutte ; L. Decin ; Hans Olofsson (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; A. de Koter ; R. Lombaert ; S. Milam ; S. Ramstedt
Conference on Why Galaxies Care About AGB Stars III: A Closer Look in Space and Time, Vienna, 28- July - 1 Aug. 2014: (Astronomical Society of the Pacific Conference Series) Vol. 497 (2015), p. 289-294.
[Konferensbidrag, refereegranskat]

Isotopic ratios are by far the best diagnostic tracers of the stellar origin of elements, as they are very sensitive to the precise conditions in the nuclear burning regions. They allow us to give direct constraints on stellar evolution models and on the progenitor mass. However, up to now different isotopic ratios have been well constrained for only a handful of Asymptotic Giant Branch (AGB) stars. We present new data on isotopologue lines of a well-selected sample of AGB stars, covering the three spectral classes of C-, S- and M-type stars. We report on the first efforts made in determining accurate isotopologue fractions, focusing on oxygen isotopes which are a crucial tracer of the poorly constrained extra mixing processes in stellar atmospheres.

Nyckelord: giant branch stars, circumstellar envelopes, ik tauri



Denna post skapades 2016-03-30.
CPL Pubid: 233852