The rapid evolution of the central star of the Stingray Nebula — latest news from the HST

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

物理学;天文学

Reindl, Nicole^1 ; Rauch, Thomas^1 ; Miller Bertolami, Marcelo M.^2 ; Werner, Klaus^1

Institute for Astronomy and Astrophysics, Kepler Center for Astro and Particle Physics, Eberhard Karls University, Sand 1, Tübingen

72076, Germany^1

Instituto de Astrofísica de la Plata, UNLP-CONICET, La Plata, Buenos Aires

1900, Argentina^2

关键词: Asymptotic giant branch;    Evolutionary history;    Ground-based observations;    Low mass;    Non-LTE;    Real time;    Stellar evolutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/3/032006/pdf
DOI  :  10.1088/1742-6596/728/3/032006

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

SAO 244567 is an unusually fast evolving star. Within twenty years only, it had turned from a B-type supergiant into the central star of the Stingray Nebula. Space- and ground-based observations obtained over the last decades have revealed that its spectrum changes noticeably over just a few years, showing stellar evolution in real time. The low mass of SAO 244567 is, however, in strong contradiction with canonical post-asymptotic giant branch evolution. Thus, its fast evolution has been a mystery for decades. We present preliminary results of the non-LTE spectral analyis of the recently obtained HST/COS observations, which finally allow us to shed light on the evolutionary history of this extraordinary object.