标题： 光度学和运动学研究开放星团 Ruprecht 1 和 Ruprecht 171 显示英文标题

标题： Photometric and kinematic studies of open clusters Ruprecht 1 and Ruprecht 171

摘要： 本研究详细调查了使用CCD{\it UBV}和{\it 盖亚}DR3 数据集的两个开放星团Ruprecht 1（Rup-1）和Ruprecht 171（Rup-171）。 如颜色消光、光度金属丰度、年龄和等时线距离等基本天体物理参数是基于{\it UBV}数据分析得出的，而成员概率计算、结构和天体物理参数以及运动学分析则是基于{\it 盖亚}DR3 数据。 我们分别识别出74颗和596颗恒星作为Rup-1和Rup-171最可能的星团成员，其成员概率超过50%。 颜色消光$E(B-V)$分别获得为$0.166\pm0.022$和$0.301\pm0.027$星等。 光度金属丰度分析通过考虑F-G型主序成员星，发现Rup-1和Rup-171的[Fe/H]=$-0.09\pm 0.16$ 和[Fe/H]=$-0.20\pm 0.20$ dex。 年龄和距离基于{\it UBV}和{\it Gaia}的数据分析；根据等时线拟合，这些值被估计为 Rup-1 的$t=580\pm60$百万年，$d=1469\pm57$光年，以及 Rup-171 的$t=2700\pm200$百万年，$d=1509\pm69$光年。 现今日的Rup-1质量函数斜率估计为$1.26\pm0.32$，Rup-171为$1.53\pm1.49$。 银河轨道积分分析表明，这两个星团可能是在太阳圈外形成的。 显示英文摘要

摘要： This study outlines a detailed investigation using CCD {\it UBV} and {\it Gaia} DR3 data sets of the two open clusters Ruprecht 1 (Rup-1) and Ruprecht 171 (Rup-171). Fundamental astrophysical parameters such as color excesses, photometric metallicities, ages, and isochrone distances were based on {\it UBV}-data analyses, whereas membership probability calculations, structural and astrophysical parameters, as well as the kinematic analyses were based on {\it Gaia} DR3-data. We identified 74 and 596 stars as the most probable cluster members with membership probabilities over 50\% for Rup-1 and Rup-171, respectively. The color excesses $E(B-V)$ were obtained as $0.166\pm0.022$ and $0.301\pm0.027$ mag for Rup-1 and Rup-171, respectively. Photometric metallicity analyses were performed by considering F-G type main-sequence member stars and found to be [Fe/H]=$-0.09\pm 0.16$ and [Fe/H]=$-0.20\pm 0.20$ dex for Rup-1 and Rup-171, respectively. Ages and distances were based on both {\it UBV} and {\it Gaia}-data analyses; according to isochrone-fitting these values were estimated to be $t=580\pm60$ Myr, $d=1469\pm57$ pc for Rup-1 and $t=2700\pm200$ Myr, $d=1509\pm69$ pc for Rup-171. The present-day mass function slope of Rup-1 was estimated as $1.26\pm0.32$ and Rup-171 as $1.53\pm1.49$. Galactic orbit integration analyses showed that both of the clusters might be formed outside the solar circle.