Chemistry in Protoplanetary Nebulae
Chemistry in Protoplanetary Nebulae
复制标题
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
中科院分区:
文献类型:
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作者:
Paul M. Woods;T. Millar;E. Herbst;A. Zijlstra
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.