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Survey of the Outer Galaxy

外星系巡天

基本信息

批准号：
05452017
负责人：
NAKADA Yoshikazu
金额：
$ 4.48万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452017/
关键词：
red giant Galaxy

项目摘要

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.

红巨星表现出一系列的特性，使它们对研究银河系的遥远区域特别有用。它们本质上是明亮的，使得在几千兆元的距离上探测和处理它们成为可能。它们足够丰富，可以用来搜索银河系的整体结构。安装在基索·施密特望远镜上的CCD相机被用来拍摄反银河系中心的图像。为了区分碳星和m型红巨星，在宽频带滤光片V和I的基础上增加了中波段滤光片[79]和[81]。从这些图像中获得的彩色星等图显示了两个序列，可能对应于英仙座臂和我们银河系的外缘。较低层序的清晰描绘表明，恒星密度分布急剧下降。在每种颜色图的碳星分支上发现了几颗恒星。另一方面，很少有恒星位于m型巨枝上。对这种明显对比的确认是未来研究的主题。Nobeyama 45米射电望远镜观测到近100个IRAS源SiO脉泽发射。检出率低得惊人，部分原因是受到了富碳源的污染。他们还用基索·施密特望远镜反复观察，以确定他们的光变化的周期。大画幅CCD相机的研制在木索天文台刚刚开始。使用这种新型CCD相机的巡天观测将在未来对银河系结构的研究中蓬勃发展。