Deep Searches for Herbig-Haro Objects, in Particular of Two New Types - Giant Bow Shocks and Mini-Jets

该研究项目的主要目的是在选定的恒星形成区域对赫比格-哈罗（HH）天体进行深入搜索，并希望建立两个新的HH天体类别，即“巨型弓形激波”和“迷你射流”。前者是一个巨大的激波结构，位于主弓激波前面，这是由于HH激动星之前的喷发造成的。后者被怀疑来自非常低质量的年轻恒星物体。我们已经在猎户座的L1641暗星云中发现了大约700个红色小星云，通过比较红色和蓝色的深施密特盘，它们可能是HH的候选者。它们包括四个可能的巨大弓形激波和十多个可能的迷你喷气机。我们计划将调查扩展到L1630黑云和NGC 2264/Mon OB1区域，但无法完成。L1641中一些HH候选者的多目标光纤光谱数据约简也尚未完成。这些数据应该能说明上述天体中有多少是真正的HHs。除此之外，我们还进行了两个或多或少相关的课题的研究。首先，我们给出了猎户座区域大约80个分散的、光学可见的小云的目录。我们怀疑它们是主恒星形成活动遗留下来的巨大分子云的云核，并称之为“残余分子云”。其次，我们分析了CO和^<1S>CO数据，发现了与巨大HH复合体HH 135/136相关的高速分子流出。由此得出结论，HH激发源发出的射流与云核碰撞并发生偏转，在HH 136中显示出速度反转。

The principal aim of this research project is to make deep searches for Herbig-Haro (HH) objects in selected star-forming regions and hopefully to establish two new categories of HH objects, namely "giant bow shocks" and "mini-jets". The former is a huge shock structure located in front of the main bow shock due to a previous eruption of the HH exciting star. The latter is suspected to emanate from very low-mass, young stellar objects.We have picked up around 700 small red nebulosities as likely HH candidates in the L1641 dark cloud in Orion by comparing deep Schmidt plates in the red and blue. They include four probable giant bow shocks and over a dozen of possible mini-jets. We planned to extend the surveys to the L1630 dark cloud and to the NGC 2264/Mon OB1 region, but could not finish. Also the data reduction of the multi-object fiber spectroscopy for some of the HH candidates in L1641 have not not been completed. These data should clarify how many percent of the above objects are bona fide HHs.In addition to the above, we carried out two studies on more or less related topics. First, a catalog is presented of about 80 scattered, small clouds optically visible in the Orion region. We suspect them to be cloud cores of the giant molecular cloud left over from the main star forming activity and call them "remnant molecular clouds". Second, we analyzed the CO and ^<1S>CO data and discovered a high-velocity molecular outflow associated with the giant HH complex HH 135/136. It is concluded that a jet emanating from the HH exciting source collides with the cloud core and is deflected to show a velocity inversion in HH 136.