A chemically peculiar post-AGB star in the Small Magellanic Cloud

11th Pacific Rim Conference on Stellar Astrophysics: Physics and Chemistry of the Late Stages of Stellar Evolution

物理学;天文学

Kamath, D.^1 ; Van Winckel, H.^1 ; De Smedt, K.^1 ; Wood, P.R.^2

Instituut voor Sterrenkunde, K.U.Leuven, Celestijnenlaan 200D bus 2401, Leuven

B-3001, Belgium^1

Research School of Astronomy and Astrophysics, Mount Stromlo Observatory, Weston Creek

ACT

2611, Australia^2

关键词: Asymptotic giant branch;    Chemical abundance;    Chemical diversity;    Chemical signatures;    Chemically peculiar;    Morphological changes;    S-process;    Small magellanic clouds;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/3/032016/pdf
DOI  :  10.1088/1742-6596/728/3/032016

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Post-Asymptotic Giant Branch (post-AGB) stars bear signatures of the entire chemical and morphological changes that occur prior to and during the AGB phase of evolution. These objects also provide vital clues on the ultimate fate of the star. Detailed chemical abundance studies of some of these objects have shown that they are chemically much more diverse than anticipated. As expected, some are the most s-process enriched objects known to date while others are not s-process enriched. Our recent study has revealed a star in the Small Magellanic Cloud, J005252.87-722842.9, which displays a peculiar chemical signature that does not correspond to the expected chemical diversity observed in these objects. This unique object reveals the possibility of a new stellar evolutionary channel where the star evolves without any third dredge-up episodes or during its evolution becomes devoid of its nucleosynthetic history.