Opacities and Atomic Diffusion

IF 3.2 Q2 ASTRONOMY & ASTROPHYSICS Galaxies Pub Date : 2023-04-25 DOI:10.3390/galaxies11030062
G. Alecian, M. Deal
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引用次数: 1

Abstract

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.
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不透明和原子扩散
不透明度是恒星建模的一个基本量,它在恒星的整个生命周期中起着至关重要的作用。在引力驱使星际物质坍缩成原恒星之后,不透明度决定了这些物质在恒星核心周围的结构。这种不透明性解释了辐射场是如何与物质相互作用的,以及大部分能量是如何流经恒星的。它是由光子与原子的所有微观相互作用产生的。光子和原子之间的部分动量交换产生了辐射加速度(特定于每种类型的原子),这与二级过程密切相关:原子扩散。虽然这个过程很慢,但它可以对恒星结构和化学成分的测量产生重大影响。在这篇综述中,我们讨论了目前在数字代码中计算和使用不透明度的方法。描述了原子扩散,并介绍了这一过程的研究现状。
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来源期刊
Galaxies
Galaxies Physics and Astronomy-Astronomy and Astrophysics
CiteScore
4.90
自引率
12.00%
发文量
100
审稿时长
11 weeks
期刊介绍: Es una revista internacional de acceso abierto revisada por pares que proporciona un foro avanzado para estudios relacionados con astronomía, astrofísica y cosmología. Areas temáticas Astronomía Astrofísica Cosmología Astronomía observacional: radio, infrarrojo, óptico, rayos X, neutrino, etc. Ciencia planetaria Equipos y tecnologías de astronomía. Ingeniería Aeroespacial Análisis de datos astronómicos. Astroquímica y Astrobiología. Arqueoastronomía Historia de la astronomía y cosmología. Problemas filosóficos en cosmología.
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