Observation of Infrared and Radio Lines of Molecules toward GL2591 and Comparison to Physical and Chemical Models

Preprint

25 May 1995

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/9505115

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.

Keywords

DENSITY GRADIENTS
ROTATIONAL LINES
CHEMICAL MODELS
INFRARED SOURCE
RADIO LINES
ABSORPTION
ACETYLENE
GL2591
HCN

All Related Versions

Version 1, 1995-05-25, ArXiv
Published version: The Astrophysical Journal, 450, 667.

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