Detecting the Sun in 2-Gyr old open clusters

Observations of old open clusters have been performedwith ROSAT but with limited sensitivity and spatial resolutionand allowed to investigate the evolution only of very active binaries. Currently the coronal activityage relation beyond 1Gyr is not known. We propose a 50 ks XMMNewton pointingsto the 2Gyr old clusters NGC 752 and IC 4651, which are well studied in the optical. We will study the coronal activity evolution in solar type stars, in post mainsequence and binary stars

对古老的开普勒群观测曾使用 ROSAT 进行，然而其灵敏度与空间分辨率均有限，仅能探究极为活跃的双星演化。目前，关于超过 10 亿年的冠层活动与年龄之间的关系尚不明确。本研究提议利用 XMM-Newton 对 20 亿年历史的 NGC 752 和 IC 4651 群进行 50 ks 观测，这两个群在光学波段已得到充分研究。我们将探讨太阳型恒星、主序后阶段恒星及双星中的冠层活动演化过程。