Precise Evolutionary Asteroseismology of High-AmplitudeδScuti Star AE Ursae Majoris  

作　　者：Hui-Fang Xue Jia-Shu Niu Jian-Ning Fu 

机构地区：[1]Department of Physics,Taiyuan Normal University,Jinzhong 030619,China [2]Institute of Computational and Applied Physics,Taiyuan Normal University,Jinzhong 030619,China [3]Institute of Theoretical Physics,Shanxi University,Taiyuan 030006,China [4]State Key Laboratory of Quantum Optics and Quantum Optics Devices,Shanxi University,Taiyuan 030006,China [5]Department of Astronomy,Beijing Normal University,Beijing 100875,China

出　　处：《Research in Astronomy and Astrophysics》2022年第10期61-76,共16页天文和天体物理学研究（英文版）

基　　金：support from the Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(STIP)(No.2020L0528);the Applied Basic Research Programs of Natural Science Foundation of Shanxi Province(No.202103021223320);support from the National Natural Science Foundation of China(NSFC)(Nos.12005124 and 12147215);support from the NSFC(Nos.11833002,12090040,and 12090042)。

摘　　要：Stellar structure and evolution theory is one of the bases in modern astronomy.Stellar inner structures and their evolutionary states can be precisely tested by asteroseismology,since the inner information is brought to the stellar surface by the global oscillating waves and becomes observable.For stellar evolutionary speed(i.e.,how long timescale does a star stay at a special evolution phase?),because of the insurmountable gap between the timescales of the evolutionary history of human civilization and a star,it can only be roughly tested by ensemble of stars in different evolutionary stages in most cases,and all the snapshots of these stars make up our global view of stellar evolution.The effect of stellar evolution on the structure and the corresponding global size of a pulsating star will lead to tiny period variations of its pulsation modes,which are the most valuable indicators of its evolutionary state and can be used to test the stellar evolution theory by a single star rather than ensemble of stars.Here,we report a High-AmplitudeδScuti star AE Ursae Majoris,which is located in the post main-sequence(MS)evolutionary stage and its observed linear period variation rate can be practically ascribed to its evolutionary effect.The result tests the stellar evolution theory from the pre-MS to post-MS with an unprecedented precision by a single star,and the framework can be extended to other type of pulsating stars to perform precise evolutionary asteroseismology,which aims to test the current stellar evolution theory in different evolutionary stages,discover the discrepancies between the theory and observations,and ultimately build a complete and precise stellar evolution theory to backtrack the history of each of these stars.

关 键 词：STARS VARIABLES delta Scuti-stars evolution-stars oscillations(including pulsations) 

分 类 号：P15[天文地球—天文学]