Survey of the Outer Galaxy

红巨星表现出一系列的特性，这使得它们在研究我们银河系的遥远区域时特别有用。它们本质上是明亮的，使得有可能在几个Kpc的距离内检测和处理它们。它们足够丰富，足以搜索星系的全球结构。安装在基索·施密特望远镜上的CCD相机被用来向反银河系中心拍摄图像。为了区分碳星和M型红巨星，在宽带滤光片V和I上增加了中波段滤光片[79]和[81]。从这些图像中得到的颜色等值图显示了两个序列，可能对应于英仙座臂和我们银河系的外缘。从较低的序列明显清楚地描绘出恒星密度分布的相当陡峭的下降。在每个颜色-颜色图的碳星分支上发现了几颗恒星。另一方面，M型巨型分支上的恒星很少。这一显著对比的确认是未来研究的主题。用Nobeama 45m射电望远镜观测到了近100个SiO脉泽发射的IRAS源。发现率低得令人惊讶，部分原因是富含碳源的污染。他们还用基索·施密特望远镜反复观察它们，以确定它们的光变化周期。基索天文台的大面阵CCD相机的研制才刚刚开始。使用这种新型的ccd相机进行的测量观测将在银河系结构的进一步研究中大行其道。

Red giants exhibit a range of properties which make them particularly useful to study a distant region of our galaxy. They are intrinsically bright, making it possible to detect and work on them at a distance of several kpc. They are abundant enough to search for the global structure of the galaxy.A CCD camera installed onto the Kiso Schmidt Telescope was used to take images towards the anti-Galactic center. The medium band filters [79] and [81] were added to wide band filters V and I in order to discriminate carbon stars from M-type red giants.Color magnitude diagrams obtained from these images showed two sequences which probably correspond to the Perseus arm and the outer edge of our Galaxy. Rather steep decline of the stellar density distribution was indicated from the apparently clear delineation of the lower sequence. Several stars were found on the carbon star branch of each color-color diagram. On the other hand, few stars were located on the M-type giant branch. The confirmation of this marked contrast is a subject of the future study.Nearly one hundred IRAS sources were observed for the SiO maser emission with the Nobeyama 45m radio telescope. The detection rate was surprisingly low, partly due to the contamination by the carbon rich sources. They were also observed with the Kiso Schmidt telescope repeatedly to determine the period of their light variation. Development of the large format CCD camera was just started at Kiso Observatory. Survey observations using this new CCD camera will flourish in the futere study of the Galactic structure.