Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...278..176j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 278, March 1, 1984, p. 176-185. Research supported by the University of Ill
Astronomy and Astrophysics
Astrophysics
21
Acetylene, Cyano Compounds, Late Stars, Red Giant Stars, Stellar Envelopes, Stellar Spectra, Abundance, Carbon Stars, Cyanoacetylene, Infrared Stars, Interstellar Matter, Molecular Clouds, Nebulae, Stellar Mass Ejection, Stellar Temperature
Scientific paper
Results of studies of circumstellar HC3N and of limited observations of CS, HC5N, HC7N, and NH3 are presented along with results of a preliminary excitation and abundance analysis of HC3N. Two new circumstellar HC3N sources (GL 618 and IRC + 40540) and one new circumstellar CS (CIT 6) source are found and the tentative detection of HC3N in GL 3068 and in the bipolar nebula GL 2688 are confirmed. No new sources of HC5N and NH3 are found, although IRC +40540 does show a feature near the frequency of a high J transition of HC5N. Very low rotational temperatures of HC3N are obtained, consistent with excitation by the infrared radiation field of the circumstellar envelope. A relative abundance ratio of about one for (HC3N)/(CS) is estimated for both IRC +10216 and CIT 6.
Jewell Phil R.
Snyder Lewis E.
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