UV photometry of M15

We have obtained deep FUV and NUV images of the inner region of the dense globular cluster M15 with the HST ACS. The FUV-NUV color-magnitude diagram shows a well-defined track...我们借助哈勃空间望远镜高级巡天相机（Hubble Space Telescope Advanced Camera for Surveys，HST ACS），获取了致密球状星团M15内部区域的深场远紫外（Far Ultraviolet，FUV）与近紫外（Near Ultraviolet，NUV）图像。该FUV-NUV颜色-星等图呈现出一条轮廓清晰的演化轨迹……