...
首页> 外文期刊>The Astrophysical journal >The Stellar Extreme-Ultraviolet Radiation Field
【24h】

The Stellar Extreme-Ultraviolet Radiation Field

机译:恒星极紫外辐射场

获取原文

摘要

The local extreme ultraviolet (EUV) radiation field from stellar sources has been determined by combining the EUV spectra of 54 stars, taken with the spectrometers aboard the Extreme Ultraviolet Explorer satellite. The resultant spectrum over the range 70-730 ? is estimated to be 95% complete above 400 ? and 90% complete above 200 ?. The flux contributed by two B stars and three hot white dwarfs dominate the spectrum except at the shortest wavelengths, where an assortment of EUV source types contribute. The high electron densities measured toward nearby stars can be accounted for by photoionization from this radiation field, but the spectrum is too soft to explain the overionization of helium with respect to hydrogen recently measure in the Local Cloud.
机译:来自恒星源的局部极紫外(EUV)辐射场是通过结合54颗恒星的EUV光谱确定的,该光谱是用Extreme Ultraviolet Explorer卫星上的光谱仪拍摄的。所得光谱在70-730?范围内。估计在400以上会完成95%? 200%以上达到90%。由两个B星和三个炽热的白矮星贡献的通量在光谱中占主导地位,但最短的波长除外,在这些波长中,各种EUV光源类型都起作用。可以通过该辐射场的光电离作用来解释朝向附近恒星测得的高电子密度,但是该光谱太软,无法解释最近在本地云中测量到的氦相对于氢的过离子化作用。

著录项

获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号