Sulphur-bearing species as chemical clocks for low mass protostars?

Details Sulphur-bearing species as chemical clocks for low mass protostars? Sulphur-bearing species as chemical clocks for low mass protostars?

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...399..567b&link_type=abstract

Astronomy and Astrophysics, v.399, p.567-581 (2003)

Astronomy and Astrophysics

Astrophysics

14

Stars: Formation, Radio Lines: Ism, Ism: Abundances, Astrochemistry

Scientific paper

We present observations of H2S, SO and SO2 towards a sample of Class 0 and Class I sources. The H2S abundances rule out its formation in the gas phase and we assume that it is released from grain mantles. Applying a model of the evolution of the sulphur chemistry first used in the study of hot cores, we show that this model can reproduce the results of our observations even for the relatively low temperatures and densities of these sources. We demonstrate that the chemical evolution of sulphur bearing species is a potentially valuable probe of chemical timescales in low mass star forming regions. Overall, the model indicates that Class I sources are at a later chemical evolutionary stage than their Class 0 counterparts, with an average difference in chemical age of at least 3x 103 years and an upper limit on the age of the Class I sources of a few times 105 years.

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