Be星ζTau的光谱研究

A long sequence of observations of ( Tau obtained using the grating spectrograph at the 60 / 90 cm Schmidt telescoope during 1978 Dec.-1990 Feb. and the All-Fiber-Coupler grating CCD spectrograph at the 216 cm telescope after 1990 at the Xing-long Station of Beijing Observatory is presented. The reciprocal linear dispersions of the spectra were 17 A/mm, 50 A/mm and 96 A/mm. In order to study spectroscopic behaviour in detail, we measure the radial velocities of the shell absorption lines and the equivalent width and V/ R ratio of the Hα emission line. The results show that:1. The variations of the radial velocity of the shell absorption lines appeared cycle in 1978-1985. First cycle ceased around 1982 but second one lasted shorter and the amplitude was less. During 1986-1990, the velocity values conspicuously diminished and the cyclic variation also disappeared. It is a pity that we locked the radial velocity material since 1990.2. The variations of the V / R ratio of Hα is in phase with the radial ve     

Be／X射线双星包层性质的研究

Ｂe单星和Ｂe／Ｘ射线双星作为一类特殊早型天体和特殊的大质量Ｘ射线双星,在各个波段都有与其它相同光谱型的Ｂ型天体显著不同的特征,因此长期以来引起中外天文学者的关注。首先在可见光波段发射线的存在,就是对仅产生吸收线的经典大气的挑战;其次Ｂe星作为一类早型带有包层天体,研究Ｂe星包层的性质,对研究原恒星包层性质和进一步了解早 型星其它光谱型的性质是非常重要的;再者可以研究Ｂe星的存在与星际磁场或湍流的星际     

Be星γCas1992年快变观测

The visible spectroscopic and near infrared photometric data of the Be star γ Cas were obtained on November 5,6 and 9 of 1992. Total of 13 profiles were obtained, with a reciprocal dispersion of 2.7Amm~(-1) in H_αand HeI 6678 region. The profiles for H_αand HeI 6678 of γ Cas are shown in figure 1,2 and 3, respectively.The results of the measurement in table 1 and 2 suggest that there are rapid variations in H_α and HeI 6678 emission feature. In figure 2 it is clear that there is a systematic trend indicating a red shift in latter profile relative to early profile.