UBVI photometry in 4 open clusters

Ages and distance moduli for the open clusters NGC 2204, Berkeley 39, NGC 2477, and Melotte 66 are constrained by comparing the theoretical models developed by Bertelli et al....

疏散星团（open clusters）NGC 2204、伯克利39（Berkeley 39）、NGC 2477及梅洛特66（Melotte 66）的年龄与距离模数，可通过对比贝尔泰利等人（Bertelli et al.）构建的理论模型予以约束。