second,it is important to study the envelopes of Be stars,as it is also a breakthrough to study envelopes of prototype stars and other early type stars;

• 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 ;