ISSN:
1572-946X
Keywords:
Stars
;
Chemistry
;
Diffusion
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We have assessed the role of diffusion in determining chemical abundances in molecular interface regions. Chemical models have been developed which include the appropriate diffusion terms and that are appropriate to a narrow diffusion region (∼0.01pc) that may exist at the interface between a dark core and a hot, shocked T-Tauri wind. We have assumed pressure balance throughout and have calculated the chemical abundances as functions of time and position through the interface. The results show that significant enhancements of detectable molecules/transitions are expected (e.g. CO J=6→5, OH and CH). Using a realistic value of the diffusion coefficient a diffusive region of dimension 0.01pc may be established within about 104 years. In general it seems likely that diffusion processes are highly significant on these and smaller lengthscales.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00627344
