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Astron. Astrophys. 325, 1163-1173 (1997)

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A 330-360 GHz spectral survey of G 34.3+0.15

II. Chemical modelling *

T.J. Millar 1, G.H. Macdonald 2 and A.G. Gibb 2

1 Department of Physics, UMIST, P.O. Box 88, Manchester, M60 1QD, UK
2 Electronic Engineering Laboratory, University of Kent, Canterbury, Kent CT2 7NT, UK

Received 12 September 1996 / Accepted 21 February 1997


We describe a detailed depth- and time-dependent model of the molecular cloud associated with the ultracompact H II region G 34.3+0.15. Previous work on observations of NH3 and CS indicates that the molecular cloud has three distinct physical components:- an ultracompact hot core, a compact hot core and an extended halo. We have used the physical parameters derived from these observations as input to our detailed chemical kinetic modelling. The results of the model calculations are discussed with reference to the different chemistries occuring in each component and are compared with abundances derived from our recent spectral line survey of G 34.3+0.15 (Paper I).

Key words: ISM: individual objects: G 34.3+0.15 – ISM: molecules – ISM: abundances

* Tables 5 and 6 and Figs. 1-3, 5 and 6 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: T.J. Millar

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© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998