首页> 外文OA文献 >Kinematics of Molecular Hydrogen Emission from Planetary and Pre-planetary Nebulae
【2h】

Kinematics of Molecular Hydrogen Emission from Planetary and Pre-planetary Nebulae

机译:行星和气体分子氢排放的运动学   前行星状星云

摘要

We report results from a program of high-resolution spectral mapping ofrotational H_2 emission from bipolar planetary and pre-planetary nebulae.Long-slit spectra obtained with the NOAO Phoenix near-infrared spectrometerallow us to probe the molecular kinematics of these nebulae at moderate spatialresolution. We find strong evidence of a component of rotation in theequatorial H_2 emission from the Egg nebula (RAFGL 2688). In this nebula and inthe pre-planetary nebula RAFGL 618, the H_2 kinematics point to the recentemergence of high-velocity polar flows, which likely mark the fairly suddenterminations of the red giant phases of their central stars. The classicalbipolar planetary NGC 2346 displays distinct kinematic components, which weinterpret as arising in the morphologically distinct equatorial and polarregions of the nebula. The H_2 rings observed in the Phoenix position-velocitymaps of this nebula support the hypothesis that ring-like planetaries thatdisplay H_2 emission possess bipolar structure.
机译:我们报告了双极行星和行星前星云旋转H_2发射的高分辨率光谱图绘制程序的结果。利用NOAO Phoenix近红外光谱仪获得的长缝光谱使我们能够在中等空间分辨率下探测这些星云的分子运动学。我们找到了强有力的证据,证明了来自星云的赤道H_2发射中的旋转分量(RAFGL 2688)。在该星云和行星前星云RAFGL 618中,H_2运动学表明高速极流的最新出现,这很可能标志着它们中心恒星的红色巨相的相当突然的终止。经典的双极行星NGC 2346显示出不同的运动学分量,我们将其解释为出现在星云的形态学上不同的赤道和极区。在该星云的菲尼克斯位置-速度图中观察到的H_2环支持这样一个假说,即显示H_2发射的环状行星具有双极结构。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利

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