Astron. Astrophys. 325, 685-692 (1997)

5. Conclusions

We have presented a 60 µm - 1.3 mm continuum study of ten Class I sources in the L1641 cloud. Our main findings are:
(i) for Class 0 and Class I sources, the use of the Hildebrand formula is a good way to obtain the circumstellar mass and , because a single temperature greybody reproduces well the observed continuum;
(ii) the exponent of the dust opacity law, , seems to increase with time, contributing to the evolution of the ( / ) ratio.

The possible evolution of with time clearly needs further investigation, especially in the mid-IR and submillimetre ranges to search for possible change in dust properties.

© European Southern Observatory (ESO) 1997

Online publication: April 28, 1998

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