Physics
Scientific paper
Nov 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..141c&link_type=abstract
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP
Physics
1
Star Formation, Ysos
Scientific paper
In this contribution I review the ISO spectrometric observations of low mass protostars. The Far Infrared spectra of low mass protostars are dominated by atomic and molecular emission lines. Ionic and atomic lines mostly originate in the PhotoDissociation Regions either created by the protostars or in which the protostars are embedded. Molecular lines are emitted either in the disk/envelopes surrounding the protostars or in the shocks at the interface between the outflows emanating from the central objects and the surroundings. ISO has permitted for the first time to observe the main oxygen bearing species in the gas around protostars and consequently to obtain the oxygen budget in those regions. I discuss in detail the interplay between gas phase CO, O and H2O during the first phases of the star formation, from the O-rich cold pre-collapse phase to the H2O-rich, yet not rich enough, collapse phase. Emphasis is given to the H2O observations towards shocked regions and the envelopes surrounding solar-type protostars.
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