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==> In this proposal, more time is being requested for JGURTLER.DUSTABS
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We propose to observe infrared spectra towards a number of young stars
located in the Chamaeleon I dark cloud using ISOPHOT-S. These
observations are an extension of the guaranteed time project "Embedded
and background infrared sources for absorption measurements". First
results from this project have shown that dust properties vary
significantly from source to source as shown by the ice features
present in the spectrum. From the analysis of the ISO spectra we will
learn about the evolution of circumstellar dust in the vicinity of
young stars. The sources located in the Chamaeleon I cloud are
excellent targets for the study of dust properties due to its proximity
and the data already existing.