Quantitative Spectroscopic Analyses of Chemically Peculiar Stars in the UV and Near-IR Regions

(1)对包括CP星在内的早期型星的高分辨紫外光谱数据进行了定量分析。它们是由IUE和哥白尼卫星获得的。分析了b型CP星中Ga II和Ga III的共振谱线，不仅在Hg-Mn星中发现了Ga的异常丰度，而且在磁性（Si型）星中也发现了Ga的异常丰度（M. Takada-Hidai， K. Sadakane, and J. Jugaku, 1986, Ap. J, 304,425）。用光谱合成方法分析了Zn - II在Hg-Mn恒星中2062 A的共振谱线。在Hg-Mn恒星中发现了锌丰度的显著差异（K. Sadakane， J. Jugaku, and M. Takada-Hidai, 1988, Ap. J, 325, 776）。分析了天狼星和织女星在1942 A的Hg II的共振谱线，发现织女星的Hg相对于太阳系的丰度是低丰度的（K. Sadakane， J. Jugaku, and M. Takada-Hidai, 1988， P. A. S. P., 100,811）。(2)利用冈山天体物理天文台的CCD探测器，获得了8700 A区12颗A型恒星的高信噪比光谱。利用模型大气分析了这12颗恒星中N I和S I的吸收谱线。在大多数恒星中，N和S的丰度都是正常的，而在两颗CP恒星（73 DMa和UMa）中，N和S的丰度都是不足的。详情将很快公布（K. Sadakane和M.Okyudo, 1989，提交给p.a.s. Japan）。

(1) High resolution ultraviolet spsectroscopic data of early type stars including CP stars are analyzed quantitatively. They were obtained with the IUE and Copernicus satellites. Resonance lines of Ga II and Ga III in B-type CP stars were analyzed and anomalous abundances of Ga were found not only in Hg-Mn stars but also in magnetic (Si type) stars (M. Takada-Hidai, K. Sadakane, and J. Jugaku, 1986, Ap. J., 304, 425). The resonance line of Zn II at 2062 A in Hg-Mn stars was analyzed using the spectrum synthsis method. A remarkable variation in the abundance of Zn was found among Hg-Mn stars (K. Sadakane, J. Jugaku, and M. Takada-Hidai, 1988, Ap. J., 325, 776). The resonance line of Hg II at 1942 A in Sirius and Vega was analyzed and Hg in Vega was found to be under-abundant with respect to the solar system abundance (K. Sadakane, J. Jugaku, and M. Takada-Hidai, 1988, P. A. S. P., 100, 811).(2) High S/N ratio spectra of 12 A-type stars in the 8700 A region were obtained using a CCD detector at the Okayama Astrophysical Observatory. Absorption lines of N I and S I were analyzed for their abundances in these 12 stars using model atmospheres. Abundances of both N and S are found to be normal in most stars while they both are underabundat in the two CP stars (73 DMa and UMa). Details will be published shortly (K. Sadakane and M.Okyudo, 1989, submitted to P. A. S. Japan).