【摘要】 提出用准直因子与分子外向流质量之间的关系，分子外向流动量变化率和质量变化率与中心源的光度关系，统计地推断作为外向流驱动源的中心星是单个存在的，还是成团的，或是尚未探测到．更多还原

【Abstract】 Bipolar molecular outflows are a basic phenomenon occurring in the forming proof stars of all masses. But massied stars often tend to be in duster when they form in molecularclouds. On the basis of studying newly observed bipolar molecular outflows associated with massive stars, the properties are suggsted to help idenify massive stars whether in cluster or not as the driving engines of the flows.更多还原