THE EXCITATION TEMPERATURE OF HC9N IN THE CIRCUMSTELLAR ENVELOPE OF IRC + 10216

被引：32

作者：

BELL, MB ^{[1
]}

AVERY, LW ^{[1
]}

MACLEOD, JM ^{[1
]}

MATTHEWS, HE ^{[1
]}

机构：

[1] NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 400卷 / 02期

关键词：

CIRCUMSTELLAR MATTER; ISM; MOLECULES; RADIO LINES; MOLECULAR; CIRCUMSTELLAR; STARS; INDIVIDUAL; (IRC; 10216);

D O I：

10.1086/172017

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have observed six relatively low energy transitions of HC9N in the circumstellar envelope of IRC + 10216. We find this long carbon-chain molecule to have a mean excitation temperature of T(ex) = 12 +/- 3 K which is similar to the values reported previously for HC3N and HC5N. If this cool HC9N gas extends to a radius of r approximately 25", we calculate a column density of N almost-equal-to 4.0 x 10(13) cm-2. We also report detection of the N = 2-1 transition of C3N.

引用

页码：551 / 555

页数：5

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