仙王座β型变星ν　Eri的测光、分光观测及脉动模式的分析

THE PHOTOMETRY AND HIGH-RESOLUTION SPECTROSCOPY AND THE PULSATIONAL MODE OF THE β CEPHEI VARIABLE STAR ν ERIDANI

本文给出了１９９１年１１月在北京天文台兴隆观测站对仙玉座β型变星νＥｒｉ进行的ｂ，ｙ波段光电测光结果，及１９９１年１２月在云南天文台观测获得的高分辨、大色散的ＳｉＩＩＩ线（０５６７Ａ）附近区的ＣＣＤ光谱。根据光变的多重周期分析结果，计算和分析了νＥｒｉ的理论脉动模式；并以高分辨的ＳｉＩＩＩ线（４５７４Ａ，４５６７Ａ）轮廓为例，分析了该星的谱线轮廓变化并计算了谱线的半宽、等值宽度以及视向速度。

Cephei stars are pulsational stars with short period.So far,their pulsational mechanics,the separation of the multiple periods and the pulsational mode are still unresolved problems.In the recent years,it is very active to study pulsational modes and shock wave phenomena with line profile variations.In this paper,based on the photometric data observed in Nov.1991,We app-lied a Fourier analysis method in separating multiple pulsational period and have got the following results:P1=0.2150,P2=0.1766,P3=0.1508.Using Stamford and Watson's continuum flux examination method,we have determined the pulsational mode of each period.P1 and P3 are nonradial pulsational modes with l=1 and l=2 respectively,P2 corresponds to a radial pulsational mode.A series of spectra-handling programs named SPYD have been worked out to handle the spectra of ν Eri near Si III(4567A) region,and we have obtained the equivalent widths,full widths in half maximum,radial velocities of SiIII(4567A),SiIII(4574A) lines with these programs in this paper.