An ALMA view of the post-AGB object HD 101584

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

物理学;天文学

Olofsson, H.^1 ; Vlemmings, W.^1 ; Maercker, M.^1 ; Humphreys, E.^2 ; Lindqvist, M.^1 ; Nyman, L.^3 ; Ramstedt, S.^4

Dept. of Earth and Space Sciences, Chalmers Univ. of Technology, Gothenburg, Sweden^1

European Southern Observatory, Garching, Germany^2

Joint ALMA Observatory, Santiago, Chile^3

Dept. of Physics and Astronomy, Uppsala University, Uppsala, Sweden^4

关键词: AGB stars;    Circumstellar;    Evolution systems;    Glass structure;    Isotopologues;    Low mass;    Maser emissions;    Most likely;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/4/042005/pdf
DOI  :  10.1088/1742-6596/728/4/042005

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

ALMA cycles 1 and 3 observations of CO isotopologues and 1.3mm continuum are used in a study of the circumstellar environment of the binary HD 101584, a post-AGB star and a low-mass companion that is most likely a post-common-envelope-evolution system. These data are supplemented with new information from OH maser emission. It is inferred that the large- scale circumstellar medium has a bipolar hour-glass structure, seen almost pole-on, formed by an energetic, ≥ 150 km s-1, jet. Significant amount of material still resides in the central region. It is proposed that the circumstellar morphology is related to an event which took place ≤ 500 yr ago, possibly a capture event where the companion spiralled in towards the AGB star. Several observed features remain to be explained, and may hint to a more complicated scenario.