Observation of C8H- toward IRC+10216

Details Observation of C8H- toward IRC+10216 Observation of C8H- toward IRC+10216

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007pasj...59l..47k&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.59, No.5, pp.L47--L50

Astronomy and Astrophysics

Astronomy

13

Ism: Molecules, Molecular Processes, Radio Lines: Stars, Stars: Circumstellar Matter, Stars: Individual (Irc +10216)

Scientific paper

Five rotational lines of the C8H- ion were observed in the circumstellar envelope of IRC +10216 with the Nobeyama 45m telescope. An improved value of the column density of the C8H radical yielded a [C8H-] frasl [C8H] ratio of 37% - nearly 4 times larger than the [C6H-] frasl [C6H] ratio (8.6%) and nearly 1500 times the [C4H-] frasl [C4H] ratio (0.024%), which may indicate more efficient formation of longer carbon chain anions. The excitation temperature of C8H- (16±2K) derived here is somewhat lower than that of the two smaller anions C6H- (32K) and C4H- (23K) in IRC +10216.

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