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.

中文翻译：

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Hertzsprung-Russell 图上的恒星 X 射线活动。一、目录

恒星磁活动提供了有关磁发电机和日冕加热过程的大量信息。我们根据 $Chandra$ 和 $Gaia$ DR2 数据提供了大约 6000 颗恒星的 X 射线活动目录。我们还将 3000 多颗恒星归类为年轻恒星天体、矮星或巨星。通过使用具有有效恒星参数和分类的恒星，我们研究了 X 射线光度 ($L_X$) 的分布和 X 射线与热光度的比值 ($R_X$)，$L_X$ 之间的正相关关系, $R_X$, 和硬度比，以及长期的 X 射线变化。该目录可用于研究一些重要的科学课题，包括活动-自转关系、不同活动指标之间的比较以及感兴趣天体（如A型恒星和巨星）的活动。举个例子，