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Photon Dominated Regions in Low UV Fields: A Study of The Peripheral Region of L1204/S140
Wenbin Li, Neal J. Evans, Daniel T. Jaffe +2
We have carried out an in-depth study of the peripheral region of the molecular cloud L1204/S140, where the far ultraviolet radiation and the density are relatively low. Our observ…
Ices in Star-Forming Regions: First Results from VLT-ISAAC
E. F. van Dishoeck, E. Dartois, W. F. Thi +8
The first results from a VLT-ISAAC program on L- and M-band infrared spectroscopy of deeply-embedded young stellar objects are presented. The advent of 8-m class telescopes allows…
Submillimeter lines from circumstellar disks around pre-main sequence stars
Gerd-Jan van Zadelhoff, Ewine F. van Dishoeck, Wing-Fai Thi +1
Observations of submillimeter lines of CO (up to J=6-5), HCO+, HCN (up to J=4-3) and their isotopes from circumstellar disks around low mass pre-main sequence stars are presented.…
H2 and CO emission from disks around TTauri and HerbigAe pre-main-sequence stars and from debris disks around young stars: warm and cold circumstellar gas
W. F. Thi, E. F. van Dishoeck, G. A. Blake +8
We present ISO-SWS observations of H2 pure-rotational line emission from the disks around low and intermediate mass pre-main-sequence stars as well as from young stars thought to b…
Gas-phase H2O and CO2 toward massive protostars
A. M. S. Boonman, E. F. van Dishoeck, F. Lahuis +2
We present a study of gas-phase H2O and CO2 toward a sample of 14 massive protostars with the Short Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (ISO). Mod…
Highly abundant HCN in the inner hot envelope of GL 2591: probing the birth of a hot core?
A. M. S. Boonman, R. Stark, F. F. S. van der Tak +5
We present observations of the v2=0 and vibrationally excited v2=1 J=9-8 rotational lines of HCN at 797 GHz toward the deeply embedded massive young stellar object GL 2591, which p…