论文标题
上层和前序列太阳能邻里明星的Evryscope-South调查
Evryscope-South Survey of Upper- and Pre-main Sequence Solar Neighborhood Stars
论文作者
论文摘要
使用Evryscope-South收集的光度数据，我们在上层序列（UMS）和梅因序列（PMS）上搜索附近的年轻变量系统。 Evryscopes是在北半球和南半球运行的全天空高积光望远镜阵列。我们将搜索基于gaia选择的年轻邻里上层和前序列序列的目录，这些序列是通过星体和光度标准选择的。我们分析了44,971 evryscope-South光曲线，以搜索可变性。我们恢复了615个变量，先前已知378个变量，以及237个新发现，包括84个年轻的黯然失色的二进制（EB）候选者。我们发现了一个新的高度古怪的二进制系统，并恢复了另外四个先前已知的系统，周期为299至674小时。我们发现158个长期（> 50 hr）候选EB系统，9个PMS和UMS的149，这将允许对Mass-Radius-age关系的限制。这些长期EBS包括179.3小时PMS系统和UMS的867.8小时系统。对于PMS可变候选者，我们估计系统年龄，非EBS的1至23 MYR范围从2至17 Myr。表现出内在变异性的其他非EB发现将使恒星旋转率，年龄，活动和质量之间的关系得以表征。
Using photometric data collected by Evryscope-South, we search for nearby young variable systems on the upper-main sequence (UMS) and pre-main sequence (PMS). The Evryscopes are all-sky high-cadence telescope arrays operating in the Northern and Southern hemispheres. We base our search on a Gaia-selected catalog of young neighborhood upper- and pre-main sequence stars which were chosen through both astrometric and photometric criteria. We analyze 44,971 Evryscope-South light curves in search of variability. We recover 615 variables, with 378 previously known, and 237 new discoveries including 84 young eclipsing binary (EB) candidates. We discover a new highly eccentric binary system and recover a further four previously known systems, with periods ranging from 299 to 674 hr. We find 158 long-period (>50 hr) candidate EB systems, 9 from the PMS and 149 from the UMS, which will allow constraints on the mass-radius-age relation. These long-period EBs include a 179.3 hr PMS system and a 867.8 hr system from the UMS. For PMS variable candidates we estimate system ages, which range from 1 to 23 Myr for non-EBs and from 2 to 17 Myr for EBs. Other non-EB discoveries that show intrinsic variability will allow relationships between stellar rotation rates, ages, activity, and mass to be characterized.
