Abstract: Observations were made for about 40H₂O masers with 13.7m telescope at Qin Ha Station of Purple Mountain Observatory since September of 1992. Results show that time variations of water masers are common in star formation regions. Sources with flux density variation above 20% are 75% of the sample. The detected ratein high mass outflow sources is higher than that in low mass ones. The correlations of maser occurence frequency with CO line widthand infrared emission intensity are discussed.

Key words: star Formation, H₂O maser, molecular outflow

摘要： 从1992年9月起，对近82个外流源或电离氢区，用紫金山天文台青海站的13.7m望远镜进行了水脉泽观测。有三个源首次测得了弱H₂O脉泽辐射；对已知源的观测结果表明星际水脉泽的时变比较普遍。流量变化20%以上的源达75%。在高质量外流源中水脉泽深测率比低质量外流源中的高。本文还讨论了脉泽产生率与CO谱线宽度及成协源红外辐射的相关性。

关键词: 恒星形成, 星际脉泽, 分子外向流