LWS observations of pre main sequence objects

Saraceno, P.
Nisini, B.
Benedettini, M.
Ceccarelli, C.
Di Giorgio, A. M.
Giannini, T.
Molinari, S.
Spinoglio, L.
Clegg, P. E.
Correia, J. C.
Griffin, M. J.
Leeks, S. J.
White, G. J.
Caux, E.
Lorenzetti, D.
Tommasi, E.
Liseau, R.
Smith, H. A.

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Publication date

January 1998

Publisher

Astronomical Society of the Pacific Conference Series

Language

English

Abstract

We review the first results of a 45-190 microns spectroscopic study of a sample of Class 0,~~Class I, ~~Class II (Herbig Ae/Be) and Herbig-Haro objects. In the observed Class 0, Class I and HH objects J shocks can account for the [OI] observed intensity, while for Ae/Be stars the [OI] emission is mainly due to the presence of photodissociation region. For some Class 0 and Class I sources, high-J CO transitions are the dominant FIR coolants, indicating the additional presence of C shocks. In these sources the H2O cooling is significantly less than that predicted by models. Finally, evidence is seen for [OI] 63 microns self-absorption in all the Class I and the Class II objects of the sample