The importance of soft X-rays for the excitation of H2 emission in planetary nebulae

被引：8
|
作者：
Phillips, JP [1 ]
机构：
[1] Inst Astron & Meteorol, Guadalajara 44130, Jalisco, Mexico
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2006年 / 368卷 / 02期
关键词：
planetary nebulae : general; infrared : ISM;
D O I：
10.1111/j.1365-2966.2006.10134.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We note that H-2 emitting planetary nebulae tend to have Zanstra temperatures T-Z(He II) > 90 kK. This is shown to be consistent with a large evolutionary lifetime, and the kinematic ages of the envelopes. Non-local thermodynamic equilibrium stellar atmospheric modelling also shows that levels of soft X-ray emission increase more rapidly than has previously been assumed, and are preferentially large in H-2 emitting sources. It is suggested that this may hold the key to explaining the strengths of the H-2 transitions.
引用
收藏
页码：819 / 824
页数：6
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