Nucleosynthesis in AGB Stars Traced by Oxygen Isotopic Ratios

被引：0
|
作者：
De Nutte, R. [1 ]
Decin, L. [1 ,2 ]
Olofsson, H. [3 ]
de Koter, A. [1 ,2 ]
Lombaert, R. [1 ]
Milam, S. [4 ]
Ramstedt, S. [5 ]
机构：
[1] Katholieke Univ Leuven, Inst Astron, Louvain, Belgium
[2] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1012 WX Amsterdam, Netherlands
[3] Chalmers, Onsala Space Observ, Dept Earth & Space Sci, S-43900 Onsala, Sweden
[4] NASA, Goddard Space Flight Ctr, Astrochem Lab, Greenbelt, MD USA
[5] Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden
来源：
WHY GALAXIES CARE ABOUT AGB STARS III: A CLOSER LOOK IN SPACE AND TIME | 2015年 / 497卷
关键词：
GIANT BRANCH STARS; CIRCUMSTELLAR ENVELOPES; IK TAURI; MASS; VAPOR; WIND; II; CO;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
引用
收藏
页码：289 / 294
页数：6
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