晚型星HR 5553、εEri和70 Oph的活动性、金属丰度和磁场的测定

THE METAL ABUNDANCES AND MAGNETIC FIELD MEASUREMENTS OF LATE TYPE ACTIVE STARS HR 5553, ε Eri AND 70 Oph

对１９９５年１１月和１９９６年３、４月间观测获得的ＨＲ５５５３、７０Ｏｐｈ和εＥｒｉ给出了高分辨率、高信噪比的阶梯光栅光谱资料．确定了这３颗晚型活动星的大气参数，采用谱线细致分析方法求出了铁（Ｆｅ）、锂（Ｌｉ）、钙（Ｃａ）、钪（Ｓｃ）、钛（Ｔｉ）、钒（Ｖ）、铬（Ｃｒ）、锰（Ｍｎ）、钴（Ｃｏ）、镍（Ｎｉ）、钇（Ｙ）、锆（Ｚｒ）和钡（Ｂａ）１３种金属元素的丰度．

The observational material of high resolution (R=6×10 4) and high signal to noise ratio(S/N=200 500) spectra of the K type chromospherically active stars HR 5553, ε Eri and 70 Oph is presented in this paper. The observations were made by using the 2.16m telescope with Coude echelle spectrograph at Xinglong Station of Beijing Astronomical Observatory in 1995 and 1996. The atmospheric parameters and abundances of 13 metallic elements for the K type dwarf component of HR 5553 and K type stars ε Eri and 70 Oph have been determined by using a detailed spectroscopic analysis. The results of determination of the model parameters and element abundances are listed in Table 3. The magnetic field measurements of HR 5553, ε Eri and 70 Oph were made by means of the Stenflo Lindegren statistical analysis. The magnetic field strength B's and the filling factors α's of the program stars are given in this paper.