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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 Equivalent width ： ウィキペディア英語版 Equivalent width The equivalent width of a spectral line is a measure of the area of the line on a plot of intensity versus wavelength. It is found by forming a rectangle with a height equal to that of continuum emission, and finding the width such that the area of the rectangle is equal to the area in the spectral line. It is a measure of the strength of spectral features that is primarily used in astronomy. ==Definition== Formally, the equivalent width is given by the equation $W\_\backslash lambda\; =\; \backslash int\; (1\; -\; F\_\backslash lambda\; /\; F\_0)\; d\backslash lambda$. Here, $F\_0$ represents the continuum intensity on either side of the absorption (or emission) feature, while $F\_\backslash lambda$ represents the intensity across the entire wavelength range of interest. Then $W\_\backslash lambda$ represents the width of a hypothetical line which drops to an intensity of zero and has the "same integrated flux deficit from the continuum as the true one."〔 This equation can be applied to either emission or absorption, but when applied to emission, the value of $W\_\backslash lambda$ is negative, and so the absolute value is used. 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「Equivalent width」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.