论文标题
蓝色Straggler星和质量后转移系统中的紫外线/Astrosat研究：在M67中检测另一种蓝色潜伏者
UVIT/ASTROSAT studies of Blue Straggler stars and post-mass transfer systems in star clusters: Detection of one more blue lurker in M67
论文作者
论文摘要
蓝色Straggler恒星（BSSS）是主要序列（MS）恒星，它们通过在MS上获得质量而避免了恒星进化。我们较早使用UVIT/ASTROSAT的研究发现了两个BSS的极低质量（ELM）白色矮人（WD）伴侣，以及一个黄色的Straggler Star（YSS），以及WD伴侣，以及主序列恒星（称为蓝色潜伏者）的WD伴侣，这表明M67中M67中的质量后转移Biinaries的良好部分。使用更深的紫外线观测，我们在这里报告了M67中另一种蓝色潜伏者的检测，并具有ELM WD伴侣。具有ELM WD的存在后的质量转移系统，包括BSS，是由情况A/B大传质形成的，不太可能在表面丰度上显示出任何差异。我们发现WD的温度与BSSS的$ v \ sin I $之间的相关性。我们还发现，大型WD的祖细胞可能属于M67中的BSS的热和发光群。紫色在球状簇NGC 5466中唯一检测到的BSS+WD系统具有正常的WD，并表明在低密度球状簇的郊区可能存在像开放群集一样的环境。
The blue straggler stars (BSSs) are main-sequence (MS) stars, which have evaded stellar evolution by acquiring mass while on the MS. The detection of extremely low mass (ELM) white dwarf (WD) companions to two BSSs and one yellow straggler star (YSS) from our earlier study using UVIT/ASTROSAT, as well as WD companions to main-sequence stars (known as blue lurkers) suggest a good fraction of post-mass transfer binaries in M67. Using deeper UVIT observations, here we report the detection of another blue lurker in M67, with an ELM WD companion. The post-mass transfer systems with the presence of ELM WDs, including BSSs, are formed from Case A/B mass transfer and are unlikely to show any difference in surface abundances. We find a correlation between the temperature of the WD and the $v\ sin i$ of the BSSs. We also find that the progenitors of the massive WDs are likely to belong to the hot and luminous group of BSSs in M67. The only detected BSS+WD system by UVIT in the globular cluster NGC 5466, has a normal WD and suggests that open cluster like environment might be present in the outskirts of low density globular clusters.
