首页     开始     To Survive in the Universe    
Inhabited Sky
    News@Sky     天文图片     收集     论坛     Blog New!     常见问题     新闻     登录  

HD 218733


目录

图像

上传图像

DSS Images   Other Images


相关文章

EUV activity in late-type stars during the ROSAT WFC All-Sky Survey - I. Techniques and initial results
We study 127 active late-type stars, including the well-known flarestars, in the extreme ultraviolet (EUV) region of the electromagneticspectrum, using the ROSAT Wide Field Camera (WFC) survey observations.Our analysis includes photometry for all the stars in the sample, timinganalysis of the observed photon events, and a statistical analysis forpossible small-scale, low-level variability. 49 stars in our sample weredetected in one or both EUV wavebands. A total of 35 flares were seen,from 23 stars, not all of them well-known flare stars. In addition,about half of the detections exhibited low-level variability. Furtheranalysis reveals that the observed low-level variability was not due torotational or orbital modulation, but rather was related to small-scaleactivity on the stars, possibly in the form of small-amplitude,flare-like events which were too faint to be recognized as individualflares at the sensitivity of the WFC. We call this low-level activity`milliflaring'. We also give estimated upper-limit count rates for thenon-detections.

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:玉夫座
右阿森松:23h10m30.39s
赤纬:-28°25'43.0"
视星:8.461
距离:227.79 天文距离
右阿森松适当运动:-9.1
赤纬适当运动:-16.7
B-T magnitude:8.971
V-T magnitude:8.504

目录:
适当名称   (Edit)
HD 1989HD 218733
TYCHO-2 2000TYC 6978-182-1
USNO-A2.0USNO-A2 0600-44443033
HIPHIP 114433

→ 要求更多目录从vizier