Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..921w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 4/AUG15, P. 921, 1994
Astronomy and Astrophysics
Astronomy
12
Scientific paper
The chemistry of collapsing protostellar cores has been reassessed so as to include the effects of desorption of molecular species from grain mantles. Several desorption mechanisms have been considered, including the mechanism by which desorption occurs as a result of H2 formation on the grains. Although the desorption time-scale is typically larger than the free-fall time, the desorption processes may result in (marginally) observable changes in the line profiles of commonly observed species. The effect is most noticeable in the case of desorption by H2 formation. If a protostellar core remains in a state of hydrostatic equilibrium for an extended period of time prior to collapse, then desorption may significantly alter the chemical composition of the core. We conclude that desorption must be included in the more general discussion of the chemical characteristics of star-forming regions. Key words: molecular processes - circumstellar matter - stars: formation - ISM: clouds - dust, extinction - ISM: molecules.
Rawlings M. C. J.
Willacy Karen
Williams David. A.
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