• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >MEASUREMENTS OF THE f-VALUES OF THE RESONANCE TRANSITIONS OF Ni II AT 1317.217 AND 1370.132 A
【24h】

MEASUREMENTS OF THE f-VALUES OF THE RESONANCE TRANSITIONS OF Ni II AT 1317.217 AND 1370.132 A

机译：Ni II在1317.217和1370.132 A处的共振跃迁的f值的测量

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have retrieved high-resolution UV spectra of 69 hot stars from the HST archive and determined the strengths of the interstellar Ni II absorption features at 1317.217 A arising from the ground 3d~9 ~2D_(5/2) electronic state to the 3d~8(~1G)4p ~2F_(5/2)~o excited level. We then compared them to absorptions to either the 3d~8(~3F)4p ~2D_(5/2)~o or 3d~8 (~3P)4p ~2P_(3/2)~o upper levels occurring at, respectively, λ = 1741.553 A (covered in the spectra of 21 of the stars) and 1370.132 A (seen for the remaining 48 stars). All spectra were recorded by the either the E140M, E140H, or E230H gratings of the Space Telescope Imaging Spectrograph. By comparing the strengths of the two lines in each spectrum and evaluating a weighted average of all such comparisons, we have found that the f-value of the 1317Aline is 1.34 ± 0.019 times the one at 1741 A, and 0.971 ± 0.014 times the one at 1370 A. We adopt as a comparison standard an experimentally determined f-value for the 1741 A line (known to 10% accuracy), so that f(1317 ) = 0.0571 ± 0.006. It follows from this f-value and our measured line-strength ratios that f(1370 ) = 0.0588 ± 0.006. As an exercise to validate our methodology, we compared the 1317 A transition to another Ni II line at 1454.842 A to the 3d~8(~1D)4p~2D_(5/2)~o level and arrived at an f-value for the latter that is consistent with a previously measured experimental value to within the expected error.
机译：我们从HST档案库中检索了69颗热星的高分辨率UV光谱，并确定了从地面3d〜9〜2D_（5/2）电子态到3d〜产生的1317.217 A星际Ni II吸收特征的强度。 8（〜1G）4p〜2F_（5/2）〜o激发水平然后，我们将它们与3d〜8（〜3F）4p〜2D_（5/2）〜o或3d〜8（〜3P）4p〜2P_（3/2）〜o发生在上面的吸收进行比较，λ= 1741.553 A（在21个恒星的光谱中发现）和1370.132 A（对于其余48个恒星可见）。所有光谱均由太空望远镜成像光谱仪的E140M，E140H或E230H光栅记录。通过比较每个光谱中两条线的强度并评估所有此类比较的加权平均值，我们发现1317Aline的f值是1741 A的f值的1.34±0.019倍，是1741 A的f值0.971±0.014倍在1370 A处。我们采用实验确定的1741 A线的f值作为比较标准（精度为10％），因此f（1317）= 0.0571±0.006。从这个f值和我们测得的线强度比得出f（1370）= 0.0588±0.006。为了验证我们的方法，我们将1317 A过渡到另一条Ni II线1454.842 A与3d〜8（〜1D）4p〜2D_（5/2）〜o的水平进行比较，得出f值为后者与先前测得的实验值一致，且在预期误差范围内。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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