Differential reddening in 21 globular clusters

The presence of differential reddening in the direction of Galactic globular clusters (GCs) has proven to be a serious limitation in the traditional colour-magnitude diagram...银河系球状星团（Galactic globular clusters, GCs）视线方向上存在的微分红化（differential reddening）现象，已被证实会对传统色-星等图（colour-magnitude diagram）的相关分析造成严重局限。