Formation of broad Balmer wings in symbiotic stars

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

物理学;天文学

Chang, Seok-Jun^1 ; Heo, Jeong-Eun^1 ; Hong, Chae-Lin^1 ; Lee, Hee-Won^1

Department of Physics and Astronomy, Sejong University, Korea, Republic of^1

关键词: Astrophysical mechanisms;    Column density;    Exponential cutoff;    Neutral hydrogen;    Poster presentations;    Quantitative comparison;    Symbiotic stars;    Thomson scattering;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/728/7/072016/pdf
DOI  :  10.1088/1742-6596/728/7/072016

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Symbiotic stars are binary systems composed of a hot white dwarf and a mass losing giant. In addition to many prominent emission lines symbiotic stars exhibit Raman scattered O VI features at 6825 and 7088 Å. Another notable feature present in the spectra of many symbiotics is the broad wings around Balmer lines. Astrophysical mechanisms that can produce broad wings include Thomson scattering by free electrons and Raman scattering of Ly,β and higher series by neutral hydrogen. In this poster presentation we produce broad wings around Hα and H,β adopting a Monte Carlo techinique in order to make a quantitative comparison of these two mechanisms. Thomson wings are characterized by the exponential cutoff given by the termal width whereas the Raman wings are dependent on the column density and continuum shape in the far UV region. A brief discussion is provided.