Selective Depletions and the Abundances of Molecules Used to Study Star Formation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We have investigated the dependences of the fractional abundances of a number of species on the selective depletions of elemental carbon, nitrogen, oxygen and sulphur, as well as metals. Of the most commonly observed species, HCO^+ is the one having the fractional abundance that is least sensitive to the selective elemental depletions and for this reason is a particularly appropriate species to study in efforts to diagnose collapse dynamics in star formation from the analysis of infall signatures in spectral line profiles. We suggest that a combination of molecules could be the focus of observations aimed at the investigation of collapse dynamics. Comparisons of the profiles of spectral features of these species would also give insight into the behaviours of the selective depletions of the different elements in the infalling gas.

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