色球活动双星54CAM主子星的大气参量和金属丰度及磁场  

THE MEASUREMENTS OF METAL ABUNDANCES AND MAGNETIC FIELD FOR PRIMARY STAR OF CHROMOSPHERICALLY ACTIVE BINARY 54CAM

作　　者：田斌[1] 刘学富[1] 

机构地区：[1]北京师范大学天文学系,北京100875

出　　处：《北京师范大学学报（自然科学版）》2000年第4期492-497,共6页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目 !(19573003)

摘　　要：根据 1998年在北京天文台用 2 .16m望远镜折轴阶梯光栅摄谱仪观测所得的高分辨( 6× 10 4 )、高信噪比 ( 2 0 0～ 30 0 )的 CCD光谱资料 ,利用细致光谱分析方法测定了 54CAM双星的主子星的大气参量 ,以及 Fe,Ti,Ni,Ca,Mn,V,Ba,Cr,Zr,Co和 L i等 11种金属元素的相对丰度 .对 Ca 三重线中的 854.2 14nm及 Hα 轮廓与参考星 UMa的谱线作了对比 ,研究了它的活动水平 .采用 Fe 的多重线统计分析方法 ,测定出 54CAM主子星的磁感应强度为 ( 580 5± 62 9)× 10 -4T,磁场覆盖因子为 ( 19± 5) % .The observed high resolution( R =6×10 4),high signal to noise ratio(200～300) spectra of chromospherically active binary 54CAM is presented. The observations were made by using the 2 16 m telescope with coude echelle spectrograph at Beijing Astronomical Observatory in 1998. The features of H α and CaⅡ IRT2(854 214 nm) are presented in order to study of chromospherically activity. The atmospheric parameters and the abundances of 11 metal for the primary star of 54CAM were determined by using a detailed spectroscopic analysis. The determonation results of the model parameters and 11 element abundances are listed. Magnetic field measurements of the primary star of 54CAM were made using the Stenflo Lindegren statistical analysis. Magnetic field strength B is (5 805± 629)× 10 -4 T and the filling factor is (19±5)%.

关 键 词：色球活动双星 金属丰度 磁场 主子星 大气参量 

分 类 号：P144.7[天文地球—天体物理]