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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Bondi accretion ： ウィキペディア英語版 Bondi accretion In astrophysics, the Bondi accretion, named after Hermann Bondi, is spherical accretion onto a compact object traveling through the interstellar medium. It is generally used in the context of neutron star and black hole accretion. To achieve an approximate form of the Bondi accretion rate, accretion is assumed to occur at a rate $\backslash dot\; \backslash simeq\; \backslash pi\; R^2\; \backslash rho\; v,$ where $\backslash rho$ is the ambient density, $v$ is either the velocity of the object or the sound speed $c\_s$ in the surrounding medium if the object's velocity is lower than the sound speed, and the radius $R$ provides an effective area. The effective radius is acquired by equating the object's escape velocity and the relevant speed, i.e. $\backslash sqrt\}\; \backslash simeq\; c\_s,$ or $R\backslash simeq\backslash frac$. The accretion rate therefore becomes $\backslash dot\; \backslash simeq\; \backslash frac$. These are only scaling relations rather than rigorous definitions. A more complete solution can be found in Bondi's original work and two other papers. ==Bibliography== * Bondi (1952) MNRAS 112, 195, (link ) * Mestel (1954) MNRAS 114, 437, (link ) * Hoyle and Lyttleton (1941) MNRAS 101, 227 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Bondi accretion」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.