Gas-Dynamical Model of Accretion on a Neutron Star with Viscosity and the Influence of Large-Scale Vortices on the Transmission of Angular Momentum

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomy Reports Pub Date : 2024-08-15 DOI:10.1134/S1063772924700422
A. G. Aksenov, V. M. Chechetkin
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Abstract

The work is devoted to the construction of a gas-dynamic model of the accretion disk around a neutron star (NS). The developed multidimensional code is used to study the stability of stationary axially symmetrical models by carry out of evolutionary calculations in 3D taking into account viscosity, as well as taking into account the diffusion of radiation in 2D. It is shown that an arbitrary stationary axially symmetrical disk with a monotonic decrease in density with a cylindrical radius transforms, due to viscosity, braking and spreading of matter along the NS, into a new quasi-stationary toroidal configuration. The stability study of the stationary toroidal configuration confirmed the formation of large-scale vortex structures at the initial periodic disturbance of angular velocity in azimuth, now taking into account the “turbulent” viscosity. It turned out that the presence of large-scale structures leads to an acceleration of braking, i.e., an effective increase in viscosity.

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具有粘度的中子星上的吸积气体动力学模型以及大尺度漩涡对角动量传递的影响
摘要 这项工作致力于构建中子星(NS)周围吸积盘的气体动力模型。所开发的多维代码用于研究静止轴对称模型的稳定性,方法是在三维中进行考虑到粘度的演化计算,以及在二维中考虑到辐射扩散。结果表明,由于粘度、制动和物质沿 NS 的扩散,一个密度单调下降、半径为圆柱形的任意静止轴对称圆盘会转变为一个新的准静止环形构型。对静止环形构型的稳定性研究证实,考虑到 "湍流 "粘度,在方位角角速度的初始周期性扰动时形成了大尺度涡旋结构。结果表明,大尺度结构的存在导致制动加速,即粘度的有效增加。
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来源期刊
Astronomy Reports
Astronomy Reports 地学天文-天文与天体物理
CiteScore
1.40
自引率
20.00%
发文量
57
审稿时长
6-12 weeks
期刊介绍: Astronomy Reports is an international peer reviewed journal that publishes original papers on astronomical topics, including theoretical and observational astrophysics, physics of the Sun, planetary astrophysics, radio astronomy, stellar astronomy, celestial mechanics, and astronomy methods and instrumentation.
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