Colour excess
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The light of a distant star is somewhat reddish due to absorption by interstellar matter, and its color index increases. This increase is called color excess, and can be calculated by subtracting the standard color index corresponding to the star's spectral type from the observed color index. This allows us to estimate the amount of absorbing material in space in that direction. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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遠方にある恒星の光は，星間物質による吸収のためいくぶん赤みがかり，色指数が増加する。その増大分を色超過といい，恒星のスペクトル型に相当する標準色指数を，観測された色指数から引くことによって求められる。これによって，その方向の空間にある吸収物質の量を推定することができる。
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