Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios
Paper i proceeding, 2015

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.

giant branch stars

circumstellar envelopes

ik tauri

Författare

R. De Nutte

L. Decin

Hans Olofsson

Chalmers, 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. 497 289-294

Ämneskategorier

Astronomi, astrofysik och kosmologi

ISBN

978-1-58381-879-4