Pulsational variability in proto-planetary nebulae and other post-AGB objects

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

物理学;天文学

Hrivnak, Bruce J.^1

Department of Physics and Astronomy, Valparaiso University, Valparaiso

IN

46383, United States^1

关键词: AGB stars;    Carbon rich;    Light curves;    Maximum amplitude;    Observational study;    Planetary nebulae;    Spectral types;    Velocity curves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/3/032013/pdf
DOI  :  10.1088/1742-6596/728/3/032013

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Light and velocity curves of several classes of pulsating stars have been successfully modeled to determine physical properties of the stars. In this observational study, we review briefly the pulsational variability of the main classes of post-AGB stars. Our attention is focused in particular on proto-planetary nebulae (PPNe), those in the short-lived phase from AGB stars to the planetary nebulae. New light curves and period analyses have been used to determine the following general properties of the PPNe variability: (a) periods range from 35 to 160 days for those of F - G spectral types, with much shorter periods (2/P1= 1.0±0.1. New models are needed to exploit these results.