ISO-LWS study of pre-main sequence sources

Saraceno, P.; Benedettini, M.; di Giorgio, A. M.; Giannini, T.; Nisini, B.; Lorenzetti, D.; Molinari, S.; Pezzuto, S.; Spinoglio, L.; Tommasi, E.; Clegg, P. E.; Correia, J. C.; Griffin, M. J.; Kaufman, M. J.; Leeks, S. J.; White, G.; Caux, E.; Liseau, R. and Smith, H. (1999). ISO-LWS study of pre-main sequence sources. In: The Physics and Chemistry of the Interstellar Medium, 22-25 Sep 1998, Zermatt, p. 279.



We present the results obtained with the ISO Long Wavelength Spectrometer on a sample of Pre-MS sources, where several molecular lines of CO, H2O and OH have been detected. The analysis of the CO lines indicates that gas temperatures as low as 200 K are consistent with the data. This would be in agreement with the relatively low abundance of water in the gas phase measured in most of the objects.

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