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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 Plummer model ： ウィキペディア英語版 Plummer model The Plummer model or Plummer sphere is a density law that was first used by H. C. Plummer to fit observations of globular clusters.〔Plummer, H. C. (1911), (On the problem of distribution in globular star clusters ), ''Mon. Not. R. Astron. Soc.'' 71, 460〕 It is now often used as toy model in N-body simulations of stellar systems. == Description of the model == The Plummer 3-dimensional density profile is given by :$\backslash rho\_P(r)\; =\; \backslash bigg(\backslash frac\backslash bigg)\backslash bigg(1+\backslash frac\backslash bigg)^\}\backslash ,,$ where ''M'' is the total mass of the cluster, and ''a'' is the Plummer radius, a scale parameter which sets the size of the cluster core. The corresponding potential is :$\backslash Phi\_P(r)\; =\; -\backslash frac\{\backslash sqrt\{r^2+a^2\}\}\backslash ,,$ where ''G'' is Newton's gravitational constant. 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「Plummer model」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.