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08 May 2024
 
  » arxiv » astro-ph/9505115

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Observation of Infrared and Radio Lines of Molecules toward GL2591 and Comparison to Physical and Chemical Models
John S. Carr ; Neal J. Evans II ; J. H. Lacy ; Shudong Zhou ;
Date:  25 May 1995
Subject:  astro-ph
Abstract: We have observed rovibrational transitions of acetylene and HCN near 13 microns in absorption toward GL2591. We also observed rotational lines of CS, HCN, H2CO, and HCO+. The combined data are analyzed in terms of models with a cloud envelope with density gradients and discrete regions of hot, dense gas, probably near the infrared source. The abundance of HCN is enhanced by a factor of 400 in the gas producing the infrared absorption, in agreement with chemical models which involve depletion of molecules onto grains and subsequent sublimation when temperatures are raised.
Source:  arXiv, astro-ph/9505115
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