对它们空间分布的研究表明：这些星属于极端星族Ⅰ，从而为进一步研究主序前和主序后中等和大质量恒星的演化提供较为完备的观测对象。
The Galactic distribution shows that most of them belong to extreme population I , and indicates the objects listed in this catalogue could mostly be stars of intermediate and high mass either in the pre - or post-main-sequence stage .
中等质量恒星