Observations were made for a number of carbon-rich circumstellar envelopes using the Phoenix spectrograph on the Gemini South telescope to determine the abundance of small carbon chain molecules.
Vibration-rotation lines of the 3 antisymmetric stretch of C3 near 2040 cm1 (4.902m) have been used to determine the column density for four carbon-rich circumstellar envelopes: CRL 865, CRL 1922, CRL 2023 and IRC +10216. We additionally calculate the column density of C5 for IRC +10216, and provide an upper limit for 5 more objects.
An upper limit estimate for the C7 column density is also provided for IRC+10216. A comparison of these column densities suggest a revision to current circumstellar chemical models may be needed.
R. J. Hargreaves, K. Hinkle, P. F. Bernath (Submitted on 21 Aug 2014)
Subjects: Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:1408.5021 [astro-ph.SR]
(or arXiv:1408.5021v1 [astro-ph.SR] for this version)
Submission history From: Robert Hargreaves [v1] Thu, 21 Aug 2014 14:50:13 GMT (142kb)
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