Compton broadening effect on spectral line formation

Autor:	A. Peraiah, M. Srinivasa Rao
Rok vydání:	2012
Předmět:	Atmosphere Physics Space and Planetary Science Radiative transfer Compton scattering Stellar atmosphere Astrophysics::Solar and Stellar Astrophysics Astronomy and Astrophysics Atomic physics Absorption (electromagnetic radiation) Electron scattering Spectral line Line (formation)
Zdroj:	Astrophysics and Space Science. 343:195-211
ISSN:	1572-946X 0004-640X
DOI:	10.1007/s10509-012-1233-0
Popis:	We have investigated the effects of Compton broadening due to electron scattering in an expanding stellar atmospheres. The line transfer equation is solved by including the second approximation of Edmonds (Astrophys. J. 119:58, 1954) which is due to Compton broadening and obtained the line profiles in (1) plane parallel (PP) (2) spherical (SS) atmospheres. The effect on spectral line formation is studied for different parameters like (a) optical depths (b) densities (c) frequencies (d) temperatures (e) thickness of the atmosphere and (f) expanding velocities. Various combination of the above parameters are used in computing the line profiles observed at infinity. Line profiles are compared for the above said parameters. It is noticed that the expansion of the gases in the atmosphere produces P-Cygni type profiles and at higher optical depths the line profiles change from emission to absorption with their line centers shifting to blue side in the expanding atmospheres.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5d78189af8a29a946e94a95a4cf28f85 https://doi.org/10.1007/s10509-012-1233-0 Zobrazit plný text záznamu Full text from SpringerLink