首页     To Survive in the Universe    
Services
    Why to Inhabit     Top Contributors     天文图片     收集     论坛     Blog New!     常见问题     登录  
→ Adopt this star  

HD 209444


目录

图像

上传图像

DSS Images   Other Images


相关文章

A magnitude limited stellar X-ray survey and the F star X-ray luminosity function
An X-ray survey has been conducted of stars brighter than visualmagnitude 8.5 that have serendipitously fallen into the fields of viewof the Imaging Proportional Counter of the Einstein Observatory. Thesurvey includes 227 separate 1 x 1 deg fields, containing 274 stars witha visual magnitude of no more than 8.5 and covering a wide range ofspectral types and luminosity classes. X-ray emission was detected from33 stars, and upper limits have been determined for the remainder of thesample. F type stars dominate the detected sample, and most of these areshown to be dwarfs. An X-ray luminosity function for dF stars has beendeduced, and reveals that the average 0.2-4.0 keV luminosity of thesestars is around 10 to the 29th erg/sec. Constraints have been placed onthe high luminosity tails and medians of the X-ray luminosity functionsfor other types of stars.

提交文章


相关链接

  • - 没有找到链接 -
提交链接


下列团体成员


观测天体数据

星座:寶瓶座
右阿森松:22h03m30.07s
赤纬:-05°41'33.4"
视星:7.638
距离:143.678 天文距离
右阿森松适当运动:57.5
赤纬适当运动:23.7
B-T magnitude:8.916
V-T magnitude:7.744

目录:
适当名称
HD 1989HD 209444
TYCHO-2 2000TYC 5230-647-1
USNO-A2.0USNO-A2 0825-19532520
HIPHIP 108895

→ 要求更多目录从vizier