【学术报告】
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报告题目： One year in the life of the fast rotator AB Doradus. Studying the rotation and photospheric activity of stars in the era of TESS
报告人： Panagiotis Ioannidis博士
报告人单位： 德国汉堡大学
报告时间： 2019年11月29日（星期五）上午10:00--11:00
报告地点： 主楼二楼228会议室
报告语言： 英文
报告摘要：
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One the the key properties of stars in order to understand their behavior is their rotation period. In most of the cases measuring the rotation period of stars is possible by following the movement of active regions which rotate with the star. Studies based on data from the Kepler satellite showed that long term and uninterrupted observations of stars can allow us to measure with more confidence the rotation period and temporal evolution of spots. With the Transiting Exoplanet Survey Satellite (TESS) we can now proceed one step further, i.e., to study not random stars, limited by the observation sample of a mission, but rather well known and previously studied stars with specific properties (e.g. known planet hosts, flare stars, pulsators etc.) Following that principal we analyzed one year of data of the fast rotator AB Dor, as observed from TESS. We measure the rotation period of AB Dor and we study the evolution of its active regions, which appear to be highly preferential, with long life times and what we interpret as small differential rotation. With the confirmation of the activity features of a heavily studied star as AB Dor, we feel confident that we can proceed with similar studies on planet host stars which will allow us to better understand their properties and thus improve the characterization of their planets.
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11月20日
太阳城亚洲
