论文标题
星形簇的全球研究：二进制室，蓝色潜伏者，蓝色散落者和会员资格
Panchromatic study of star clusters: binaries, blue lurkers, blue stragglers and membership
论文作者
论文摘要
二进制系统可以演变为极大的外来系统，例如蓝色straggle恒星（BSS），黄色的straggler恒星，灾难性变量，IA型超新星，具体取决于其初始质量，轨道参数和进化。本文的目的是了解开放群集中存在的质量转移系统（BSS，白矮人和蓝色潜伏者）的人口统计以及它们的形成方式。首先，我们使用GAIA EDR3数据在六个开放群集中识别了群集成员。使用Uvit，Gaia，Galex，2 Mass和其他档案光度数据对两个群集M67和KING2进行了详细研究。全面的全型研究表明，（i）通过二进制传质，（ii）King 2中至少有15％的BSSS在M67中有强大的质量转移途径，而B蓝色潜伏者至少有15％的BSS。我们还使用GAIA DR2数据创建了开放群集BSS的同质目录。在208个簇中对868个BSS的分析表明，（i）BSS频率随着年龄的增长而增加，（ii）群集质量和最大BSS数量之间存在幂律关系，（iii）BSS的形成机制以二元质量转移（54-67％）为主（54-67％），尽管BSS的相互作用（54-67％）的相互作用与10-16％的交互作用相比，BSS的相互作用均高于2次相比2张贴。这项研究表明，二进制产品的人口统计学中存在广泛的种类，紫外线观测对于它们的检测和表征至关重要。
Binary systems can evolve into immensely different exotic systems such as blue straggle stars (BSSs), yellow straggler stars, cataclysmic variables, type Ia supernovae depending on their initial mass, the orbital parameters and evolution. The aim of this thesis is to understand the demographics of post-mass-transfer systems (BSSs, white dwarfs and blue lurkers) present in the open clusters and how they are formed. First, we identified the cluster members using Gaia EDR3 data in six open clusters. Two of the clusters, M67 and King2, were studied in detail using UVIT, Gaia, GALEX, 2MASS and other archival photometric data. The comprehensive panchromatic study showed that (i) there is a robust mass-transfer pathway for BSSs, and blue lurkers in M67, (ii) at least 15% of BSSs in King 2 were formed via binary mass transfer. We also created a homogeneous catalogue of open cluster BSSs using Gaia DR2 data. The analysis of 868 BSSs across 208 clusters showed that (i) BSS frequency increases with age, (ii) there is a power-law relation between cluster mass and maximum number of BSSs, (iii) the formation mechanism of BSSs is dominated by binary mass transfer (54-67%) though there exists a 10-16% chance of BSSs forming through more than 2 stellar interactions. This study demonstrates that there exists an extensive variety in the demographics of binary products, and the UV observations are vital for their detection and characterisation.
