论文标题
球形群集M10：使用其变量和HB星对恒星成员，距离和年龄进行重新评估
The globular cluster M10: Reassessment of stellar membership, distance and age using its variable and HB stars
论文作者
论文摘要
球状群集M10（NGC 6254）的时间序列VI CCD光度法用于执行详细的识别，对其光曲线的检查，分类和群集成员资格，这些变量是2018年报告的所有已知变量。成员分析均基于GAIA-DRE2位置和适当的运动。簇的金属性是根据簇中已知的唯一RRC星估计的。其光曲线的傅立叶分解导致[fe/h] zw = -1：59 $ \ pm $ 0:23 dex。通过多种独立方法估算的平均群集距离为5.0 $ \ pm $ 0.3 kpc。在群集周围的大约10x10 arcmin2区域中的多诉搜索显示了三个新变量，一个SX PHE（V35）和两个正弦变量，在不清楚的分类的红色巨型分支上（V36，V37）。对HB恒星进行建模对恒星氢壳体质量非常敏感，该壳围绕0.50 m $ _ \ odot $ helium Core。为了匹配HB人口的完整范围，需要总质量为0.56至0.62 m $ _ \ odot $。这些模型支持5.35 kpc的距离，年龄约为13个回旋，并暗示了上Uppper RGB上质量损失的某些个体变化，这可能是由于红色巨人中闭合磁场的存在引起的。
Time-series VI CCD photometry of the globular cluster M10 (NGC 6254) is employed to perform a detailed identification, inspection of their light curves, their classification and their cluster membership, of all the known variables reported up to 2018. The membership analysis is based on the Gaia-DR2 positions and proper motions. The metallicity of the cluster is estimated based on the sole RRc star known in the cluster. The Fourier decomposition of its light curve leads to [Fe/H]ZW=-1:59 $\pm$ 0:23 dex. The mean cluster distance, estimated by several independent methods is 5.0 $\pm$ 0.3 kpc. A multi-approach search in a region of about 10x10 arcmin2 around the cluster revealed three new variables, one SX Phe (V35) and two sinusoidal variables on the red giant branch of unclear classification (V36,V37). Modelling the HB stars is very sensitive to the stellar hydrogen shell mass, which surrounds the 0.50 M$_\odot$ helium core. To match the full stretch of the HB population, a range of total mass of 0.56 to 0.62 M$_\odot$ is required. These models support a distance of 5.35 kpc and an age of about 13 Gyrs, and hints to some individual variation of the mass loss on the uppper RGB, perhaps caused by the presence of closed magnetic field in red giants.
