论文标题
横跨Hertzsprung-Russell图的恒星X射线活动。 I.目录
Stellar X-ray activity across the Hertzsprung-Russell diagram. I. Catalogs
论文作者
论文摘要
恒星磁性活动提供了有关磁发电机和冠状加热过程的大量信息。我们根据$ chandra $和$ gaia $ dr2数据提供了约6000星的X射线活动目录。我们还将3000多颗星星归类为年轻的恒星物体，矮星或巨星。通过使用具有有效恒星参数和分类的星星，我们研究了X射线发光度（$ L_X $）的分布以及X射线与体亮度亮度的比率（$ R_X $），$ L_X $，$ R_X $和硬度X射线变量的正相关。该目录可用于研究一些重要的科学主题，包括活动转机关系，不同的活动指标之间的比较以及有趣的对象的活动（例如A型恒星和巨人）。例如，我们使用目录来研究活动旋转关系，并发现年轻的恒星对象，矮人和巨人属于关系中的单个顺序$ r_x $对Rossby数字，而巨人则不遵循$ r_x $ r_x $ r_x $ p _ vers $ p _ {
Stellar magnetic activity provides substantial information on the magnetic dynamo and the coronal heating process. We present a catalog of X-ray activity for about 6000 stars, based on the $Chandra$ and $Gaia$ DR2 data. We also classified more than 3000 stars as young stellar objects, dwarf stars, or giant stars. By using the stars with valid stellar parameters and classifications, we studied the distribution of X-ray luminosity ($L_X$) and the ratio of X-ray-to-bolometric luminosities ($R_X$), the positive relation between $L_X$, $R_X$, and hardness ratio, and the long-term X-ray variation. This catalog can be used to investigate some important scientific topics, including the activity-rotation relation, the comparison between different activity indicators, and the activities of interesting objects (e.g., A-type stars and giants). As an example, we use the catalog to study the activity-rotation relation, and find that the young stellar objects, dwarfs, and giants fall on a single sequence in the relation $R_X$ versus Rossby number, while the giants do not follow the relation $R_X$ versus $P_{\rm rot}^{-2}R^{-4}$ valid for dwarfs.
