Searches for Emission-line Stars of T Tauri and Related Types in the Nearest Molecular Cloud L1457

这个项目的主要目的是在最近的恒星形成分子云中完成对T金牛座及其相关类型的Hα发射星的搜索。我们计划充分利用夏威夷莫纳克亚天文台优越的观测条件，以及新开发的WFGS2格栅光谱仪与夏威夷大学2.2米望远镜相结合的宽广视场。L1457(=MBM12)最初被选为目标区域，但已被L1642取代，因为在申请外援后，前者被发现比过去认为的(65PC)更远(300PC)。由于完工延迟，WFGS2直到2004年底才可用；因此，观测在2005年1月进行。由于有限的望远镜时间和恶劣的天气条件，我们只能完成大约50%的调查区域，其余的区域是由亚美尼亚比乌拉坎天体物理天文台的Magakian博士和他的合作者使用2.6米望远镜和天蝎座的GRISE光谱仪友好地观察到的。然而，这些数据显示，除了已知的两个双天体外，没有发射Hα的恒星。因此，我们不得不得出结论，这个项目没有达到它的目标。我与D.K.Ojha博士和其他人合作在W3 Main和NGC 7538上进行了近红外光度学研究。我们在这些高质量恒星形成区探测到了大量的低质量年轻恒星。鉴于这些有趣的结果，我开始了对HII区的测量观测，以利用印度2米望远镜上的GRISM光谱仪来定位T-Tauri和相关类型的H-α发射星。2005年9月共观测到8个HII区，共探测到约140HHII发射星和15个α天体。我还参与了对年轻疏散星团NGC654和NGC663的光度研究，这两个星团大约有1200万年的历史，至今仍有一些关于它们形成过程的信息。

The main purpose of this project is to make complete searches for Hα emission stars of the T Tauri and related types in a nearest star-forming molecular cloud. We planned to make the most of the superb seeing conditions of Mauna Kea Observatory, Hawaii, and the wide field of view of the newly developed grism spectrograph WFGS2 combined with the University of Hawaii 2.2m telescope. L1457(=MBM12) was originally selected as the target region, but it has been replaces by L1642, because, just after the application for the grand-in aid, the former was found to be located farther away(300 pc) than used to be thought(65 pc).WFGS2 became available only toward the end of 2004 due to a delay in its completion ; so the observations were carried out in 2005 January. We could finish only some 50% of the survey area on account of limited telescope time and the poor weather conditions, and the rest was kindly observed by Dr.Magakian and his collaborators at the Byurakan Astrophysical observatory, Armenia, using the 2.6m telescope and the grism spectrograph SCORPIO. However those data show no Hα emission stars excepting the already known two double objects. Therefore we have to conclude that this project failed to achieve its goal.I collaborated with Dr.D.K.Ojha and others in photometric studies in the near-infrared on W3 Main and NGC 7538. We have detected a large number of low-mass young stars in these high-mass star-forming regions. In view of these interesting results I embarked on survey observations of HII regions to locate Hα emission stars of T Tauri and related types by using a grism spectrograph on a 2-m telescope in India. Eight HII regions were observed in September 2005 and altogether some 140 Hα emission stars and 15 Herbig-Haro objects have been detected. I also took part in photometric studies on young open clusters NGC654 and NGC663, which are about 12million years old and still bear some information on their formation process.