重新审查昴星团成员星锂丰度的弥散  

A Revision on Lithium Abundance Dispersin in Pleiades Stars

作　　者：熊大闰[1,2] 邓李才[2,3] 

机构地区：[1]中国科学院紫金山天文台 [2]中国科学院国家天文台 [3]北京天体物理中心

出　　处：《天文学报》2005年第3期258-272,共15页Acta Astronomica Sinica

基　　金：国家自然科学基金(10273021;10173013)资助

摘　　要：重新审查了昴星团成员星的活动性和在同一颜色处Li丰度的弥散。发现大多数的研究者低估了昴星团恒星的活动性.重新研究了恒星的活动性(包括黑子活动)和星团中恒星的不均匀红化效应对Li丰度弥散的影响.得到的主要结论是:没有坚实的证据说明观测到的Li丰度弥散是代表具相同有效温度星团成员大气Li丰度存在真实的差异.相反,假若不是全部,其大部的视Li丰度弥散是活动星的大气效应所致.Li丰度-恒星自转关联很可能只是Li丰度-恒星活动性关联的一种反映.Stellar activity and Li abundance dispersion at fixed color are revised for Pleiades stars. It has been found that the stellar activity is underestimated by the most authors. The effects of stellar activity (including stellar spots) and inhomogeneous reddening over the cluster on Li abundance dispersion are studied. The main conclusions of this work are that there are no solid evidences to support that the observed Li abundance dispersion indicates a real difference in the atmosphere of cluster member stars with a same effective temperature. Instead, the most, if it is not all, apparent dispersion are induced by atmosphere effects of active stars. The Li abundance-rotation relation may be a reflection of Li abundance-stellar activity correlation.

关 键 词：疏散星团和星协 昴星团 恒星 元素丰度 恒星 晚型 恒星 活动 

分 类 号：P152[天文地球—天文学]