基于50BiN望远镜的疏散星团NGC 7789的变星搜寻研究  

Observational Study of Variable Starsin Open Cluster NGC 7789 Based on 50 BiN Telescope

作　　者：叶倩 王坤[1] 彭宇慧 YE Qian;WANG Kun;PENG Yu-hui(School of Physics and Astronomy,China West Normal University,Nanchong Sichuan 637009,China)

机构地区：[1]西华师范大学物理与天文学院,四川南充637009

出　　处：《西华师范大学学报（自然科学版）》2025年第1期79-85,共7页Journal of China West Normal University(Natural Sciences)

基　　金：国家自然科学基金项目(12003022)。

摘　　要：基于西华师范大学50BiN望远镜获得的长时序测光观测数据,在疏散星团NGC 7789及其周围的20′×20′视场中搜寻到19颗变星,其中10颗是本次观测发现的。基于变星在NGC 7789颜色星等图上的位置、星团成员星概率和Gaia视差,对这19颗变星的星团成员星性质进行初步分析。结果表明,17颗变星可能是星团成员,2颗可能是场星。根据变星光变曲线的形状,周期的长度以及在颜色星等图上的位置,对这19颗变星的分类进行了初步讨论。结果表明,13颗是短周期变星(3颗δ Scuti, 7颗食双星、3颗未知类型变星),6颗是长周期变星。研究扩大了星团变星的样本数量,为开展单个变星的星震学研究和星团变星的统计研究奠定了基础。Based on the long-term photometric observation data obtained by 50BiN telescope in China West Normal University,19 variable stars are found in the 20′×20′field of view in and around open cluster NGC 7789,among which 10 variable stars are newly discovered in this observation.A preliminary property analysis of these 19 variable stars as cluster members was based on their positions on the color-magnitude diagram of NGC 7789,the membership probabilities of cluster members and Gaia parallax.The results reveal that 17 of the variable stars are likely to be cluster members,while the other 2 might be field stars.In accordance with the shape of their light curves,the length of their periods,and their positions on the color-magnitude diagram,a preliminary classification of these 19 variable stars is carried out.The results indicate that 13 of them are short-period variables,comprising of 3δScuti stars,7 eclipsing binaries,and 3 variables of unknown types.The remaining 6 variable stars are classified as long-period variables.This study has expanded the sample size of variable stars in star clusters and laid a foundation for conducting asteroseismology research on individual variable star and statistical study on variable stars in star clusters.

关 键 词：50BiN 疏散星团 变星 NGC 7789 δScuti 

分 类 号：P141[天文地球—天体物理]