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名稱Title
2018天文年會
國立金門大學
5月18日至20日

論文摘要

X-ray Sources in The Nearby, Intermediate-Age Coma Berenices Star Cluster

[ Poster PS20 ]

Wira Hadiputrawan (Graduate Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan); W.P. Chen (Graduate Institute of Astronomy, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan), Shih-Yun Tang (Department of Physics, National Central University, 300 Zhongda Road, Zhongli, Taoyuan, 32001, Taiwan)

X-ray emissions are common in stars. Luminous OB stars produce X-rays by wind collision. Low-mass stars, with differential rotation plus convective interior, are magnetically active so as to power coronae 106 K or above to radiate in X-rays. Coma Berenices, at 85 pc is one of the nearby open clusters with an intermediate age (800 Myr). Previous studies found no X-ray sources in this cluster. We exercised the latest, most reliable list of stellar and substellar members, and found at least 15 X-ray emitters. This work presents how X-rays, i.e. magnetic activity, varies with spectral type, and incorporating results for star clusters of different ages, how the magnetic activity in turn evolves with time.