Opacities and Atomic Diffusion

被引：1

作者：

Alecian, Georges ^{[1
]}

Deal, Morgan ^{[2
]}

机构：

[1] Univ Paris Cite, Univ PSL, Ctr Natl Rech Sci CNRS, Lab Univers & Theories LUTH,Observ Paris, 5 Pl Jules Janssen, F-92190 Meudon, France

[2] Univ Montpellier, Ctr Natl Rech Sci CNRS, Lab Univers & Particules Montpellier LUPM, Pl Eugene Bataillon, F-34095 Montpellier, France

来源：

GALAXIES | 2023年 / 11卷 / 03期

关键词：

opacities; atomic diffusion; surface abundances; stellar interior; stellar atmosphere; DRIVEN STELLAR WINDS; RADIATIVE ACCELERATIONS; APPROXIMATE FORMULAS; B-STARS; ATMOSPHERES; EVOLUTION; PULSATIONS; STRATIFICATION; EXCITATION; MECHANISM;

D O I：

10.3390/galaxies11030062

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Opacity is a fundamental quantity for stellar modeling, and it plays an essential role throughout the life of stars. After gravity drives the collapse of interstellar matter into a protostar, the opacity determines how this matter is structured around the stellar core. The opacity explains how the radiation field interacts with the matter and how a major part of the energy flows through the star. It results from all the microscopic interactions of photons with atoms. Part of the momentum exchange between photons and atoms gives rise to radiative accelerations (specific to each type of atom), which are strongly involved in a second-order process: atomic diffusion. Although this process is a slow one, it can have a significant impact on stellar structure and chemical composition measurements. In this review, we discuss the way opacities are presently computed and used in numerical codes. Atomic diffusion is described, and the current status of the consideration of this process is presented.

引用

页数：20

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