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深入搜索赫比格-哈罗（HH）天体，并希望建立两个新的HH天体类别，即“巨型弓形激波”和“小型喷流”。前者是由于HH激发星星的前一次爆发而形成的位于主弓激波前方的巨大激波结构。后者被怀疑是来自质量非常低的年轻恒星天体。通过比较红色和蓝色的深施密特板，我们在猎户座L1641暗云中发现了大约700个红色小星云，可能是HH候选者。它们包括四个可能的巨大弓形激波和十几个可能的小型喷气式飞机。我们计划将调查扩展到L1630暗云和NGC 2264/Mon OB 1区域，但未能完成。此外，L1641中某些HH候选物的多目标光纤光谱的数据简化尚未完成。这些数据应该澄清了上述物体中有多少百分比是真正的HHS。除了上述内容，我们还进行了两项或多或少相关主题的研究。首先，一个目录是约80个分散的，在猎户座地区光学可见的小云。我们怀疑它们是主星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相关的高速分子外流。得出的结论是，从HH激发源发出的喷流与云核碰撞，并被偏转，以显示在HH 136的速度反转。

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.