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MOLECULAR DESORPTION FROM DUST IN STAR-FORMING REGIONS

WILLACY, K; RAWLINGS, JMC; WILLIAMS, DA; (1994) MOLECULAR DESORPTION FROM DUST IN STAR-FORMING REGIONS. MON NOT R ASTRON SOC , 269 (4) 921 - 927.

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Abstract

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 H-2 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 H-2 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.

Type:Article
Title:MOLECULAR DESORPTION FROM DUST IN STAR-FORMING REGIONS
Keywords:MOLECULAR PROCESSES, CIRCUMSTELLAR MATTER, STARS, FORMATION, ISM, CLOUDS, DUST, EXTINCTION, ISM, MOLECULES, DENSE INTERSTELLAR CLOUDS, CHEMISTRY, GRAINS, COLLAPSE, CORES, B335
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Physics and Astronomy

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