摘要
仙干座β型星是上部土序的一类短周期变星,它们的脉动起因是一个长期使人困惑的问题。本文评述了仙干座β型星的一些观测特性,如物理参数,不稳定带在赫罗图中的位置,演化阶段,周期和脉动模式等。我们同时也讨论了几个脉动激发机制,即恒星通过什么途径使别的能量转化为脉动的机械能。机制分深层和包层两类,重点讨论了不透明度机制。
Cephei sturs ure a groue of short-petiod ariables Finding the excitation mechanism for them and other early varables is a long standing problem. In the present paper, the observational states of B Cepbei stars is reviewed, their location in the H-R diagram . evoiutionary stege. pulsatron mode and other observational properties are discussed. We also review the pulsational meahanisms of B Cephei stars including deep and envelope exci-cation mechanisms, with emphasis on opacity me.
