Chemistry in Protoplanetary Nebulae

Chemistry in Protoplanetary Nebulae
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原行星状星云中的化学

DOI:
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发表时间:
2003
期刊:
影响因子:
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通讯作者:
A. Zijlstra
A. Zijlstra
中科院分区:
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文献类型:
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作者:
Paul M. Woods;T. Millar;E. Herbst;A. Zijlstra

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我们已经调查了气相化学残余红巨星风,在过渡到行星状星云,使用相互作用的恒星风模型。据预测,在核心星星升温的100年内,大多数现有分子会被紫外线迅速摧毁,这表明CRL 618中的大分子可能在几年内被摧毁。然而,一些氢化分子和离子(例如,CH+,CH+ 2,CH+2,CH,CH 2,NH)可能形成于相互作用恒星风模型预测的激波之后。此外,存活和/或形成可观察量的一些分子(例如,HCN,CN,HC 3 N)可能以致密的团块形式存在,并在过渡期存活下来,这可能解释了NGC 7027中的HCN。
We have investigated gas-phase chemistry in a remnant red giant wind, during transition to a planetary nebula, using the interacting stellar winds model. Rapid destruction by UV of most existing molecules is predicted, within ∼ 100 yrs of the core star heating up, suggesting that the large molecules in CRL 618 may be destroyed within deeades. However, significant abundances of some hydrogenated molecules and ions (eg. CH+, CH+ 2, CH+ 2, CH, CH2, NH) may form behind the shoek predicted by the interacting stellar winds model. Also, survival and/or formation of observable amounts of some molecules (eg. HCN, CN, HC3 N) may oeeur in dense clumps which survive transition, and may explain the existence eg. of HCN in NGC 7027.