SIMBAD references

2003A&A...399..567B - Astronomy and Astrophysics, volume 399, 567-581 (2003/2-4)

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


Abstract (from CDS):

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 3x103 years and an upper limit on the age of the Class I sources of a few times 105 years.

Abstract Copyright:

Journal keyword(s): stars: formation - radio lines: ISM - ISM: abundances - astrochemistry

CDS comments: Table 2 : SMM NN objects are [CED93] NN in SIMBAD.

Simbad objects: 20

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