【摘要】 利用国家天文台兴隆观测站 2 16m望远镜及其附属的阶梯光栅摄谱仪 ,我们对金牛座α星 (αTau)进行了高分辨率、高信躁比的光谱观测。并在此基础上 ,通过对光谱中 2 2条谱线中心波长的证认 ,最终得出αTau在日心坐标架下的视向速度为 5 45 5km·s-1,标准偏差σ～ 1km·s-1。光谱的处理工作是在天文数据处理软件包MIDAS下完成的。更多还原

【Abstract】 High precision heliocentric radial velocity of α Tauris has been obtained using the 2 16 m telescope and its Coudé Echelle spectrograph at Xinglong Station,National Astronomical Observatories.Reduction of the spectrum is carried out with the standard packages for Echelle spectra in MIDAS (A widely used data reduction facility in astronomy,which is short for Munich Image Data Analysis System).After finishing standard CCD frame reduction processes,36 orders are located on the CCD frame.A Th Ar lamp spectrum is taken for wavelength calibration.The heliocentric radial velocity is determined by comparing the central wavelengths of the lines of the program star with the standard solar static ones,giving their Doppler shifts.Then,corrections for earth′s rotation and orbital motion around the Sun are carried out.In order to gain the intrinsic radial velocity of program star,a large number of lines are usually need.In this work,56 lines are measured,and 22 are eventually adopted considering the errors of the single measurements,which are judged by the Doppler shifts with respect to that of H α ( λ 0-656 280 8 nm).The heliocentric radial velocity of α Tauris given by this work is 54 5 km·s -1 ,with a precision of σ -1 km·s -1 .更多还原