论文标题
对银河球状簇M30（NGC 7099）的远硫酸酯研究：I。光度法和径向分布
Far-ultraviolet investigation into the galactic globular cluster M30 (NGC 7099): I. Photometry and radial distributions
论文作者
论文摘要
我们提出了一项针对球状簇M30（NGC 7099）的遥远脱离（FUV）。使用高级摄像头进行调查（ACS/SBC，F150LP，FUV）和宽场行星相机2（WFPC2，F300W，UV）获得图像，它们都在Hubble Space望远镜（HST）上。 FUV-UV颜色磁性图（CMD）显示了fuv $ \ $ \ $ 22 mag和fuv-uv $ \ $ \ $ 3 mag的主序列（MS）。 MS延伸了4个MAG，可以看到一个突出的水平分支（HB）和蓝色Straggler（BS）序列。确定了总共1218毫秒的恒星，185个红色巨型分支星星，47个BS星和41 HB星，以及78个MS的蓝色来源，由白矮人（WDS）组成，WDS和MS之间的差距中的物体包括潜在的速度降低速度可变变量（CV）候选者。 BS种群的径向分布集中在群集中心，表明发生了质量分离。双BS序列的蓝色和红色子选集出现在紫外线CMD中，并且在该群集中没有看到明显的CV候选中心浓度。
We present a far-ultraviolet (FUV) study of the globular cluster M30 (NGC 7099). The images were obtained using the Advanced Camera for Surveys (ACS/SBC, F150LP, FUV) and the Wide Field Planetary Camera 2 (WFPC2, F300W, UV) which were both on board the Hubble Space Telescope (HST). The FUV-UV colour-magnitude diagram (CMD) shows a main sequence (MS) turnoff at FUV $\approx$ 22 mag and FUV-UV $\approx$ 3 mag. The MS extends 4 mag below the turnoff, and a prominent horizontal branch (HB) and blue straggler (BS) sequence can be seen. A total of 1218 MS stars, 185 red giant branch stars, 47 BS stars and 41 HB stars are identified, along with 78 sources blueward of the MS which consist of white dwarfs (WDs) and objects in the gap between the WDs and the MS that include potential cataclysmic variable (CV) candidates. The radial distribution of the BS population is concentrated towards the cluster centre, indicating that mass segregation has occurred. The blue and red sub-populations of the double BS sequence appear mixed in the ultraviolet CMD, and no significant central concentration of CV candidates is seen in this cluster.
