• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Astronomical Union >bHROS high spectral resolution observations of PN forbidden and recombination line profiles
【24h】

bHROS high spectral resolution observations of PN forbidden and recombination line profiles

机译：BNOS禁止和重组线轮廓的高光谱分辨率观察

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have acquired high spectral resolution observations (R=150,000) of the planetary nebulae NGC 7009 and NGC 6153, using bHROS on Gemini South Observations of this type may provide a key to understanding why optical recombination lines (ORLs) yield systematically higher heavy element abundances for photoionized nebulae than do the classical forbidden collisionally excited lines (CELs) emitted by the same ions; NGC 7009 and NGC 6153 have notably high ORL/CEL abundance discrepancy factors (ADFs) of 5 and 10, respectively. Due to the opposite temperature dependences of ORLs and CELs, ORLs should be preferentially emitted by colder plasma,. Our bHROS observations of NGC 7009 reveal that the [O III] 4363 A CEL has a FWHM linewidth that is 1,5 times larger than that shown by O II ORLs in the same spectrum, despite the fact that all of these lines are emitted by the O2+ ion. The bHROS spectra of NGC 6153 also show that its O II ORLs have significantly narrower linewidths than do the [O ill] 4363 A and 5007 A lines but, in addition, the [O III] 4363 A and 5007 A lines show very different velocity profiles, implying the presence of large temperature variations in the nebula.
机译：我们已取得的行星的高光谱分辨率的观察（R = 150,000）星云NGC 7009和NGC 6153，使用这种类型的南双子观测bHROS可以提供​​一键理解为什么光学复合线（ORLS）屈服系统更高的重元素丰度用于光电离星云比做经典禁止过碰撞激发线由相同的离子发射（CELS）; NGC 7009和6153 NGC具有5和10中，分别显着高ORL / CEL丰度差异因子（ADF）的。由于ORLS和CEL的相对温度依赖性，ORLS应优先被发出更冷的等离子体,.我们的bHROS NGC 7009的观察揭示，〔O III] 4363 A CEL具有FWHM线宽比该被O II ORLS在相同的频谱示出较大的1.5倍，尽管所有这些线路被发射的事实的O 2 +离子。所述bHROS谱中NGC 6153还显示，其öII ORLS具有比做〔O生病] 4363 A和5007条甲线，但，除此之外，〔O III] 4363 A和5007条甲线显示出非常不同的速度显著窄线宽轮廓，这意味着在星云大的温度变化的存在。

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