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Paper: LWS observations of the protostar IRAS16293-2422
Volume: 132, Star Formation with the Infrared Space Observatory (ISO)
Page: 243
Authors: Ceccarelli, C.; Caux, E.; White, G. J.; Molinari, S.; Furniss, I.; Liseau, R.; Nisini, B.; Saraceno, P.; Spinoglio, L.
Abstract: We report ISO-LWS observations toward the low mass star IRAS16293-2422 between 43 microns - 197 microns. The CO, H_2O and OH rotational lines and the OI(63 microns) fine-structure line dominate the spectrum. Combining the CO Jup=14 to 25 observations with previous Jup=6 measurements, we derive stringent limits on the density (~3 cdot 10^4cm^{-3}), temperature (~1500 K), and column density (~1.5 \cdot 1020cm^{-2}) of the emitting gas. We show that this warm gas is associated with the outflow and that a low velocity, C-type shock can account for the characteristics of the CO spectrum. The H_2O and OH abundances derived from the observed line fluxes are [H_2O] / [H_2] ~2 \cdot 10^{-5} and [OH] / [H_2] ~5 \cdot 10^{-6} respectively. Finally, we speculate that the OI(63 microns) line emission originates in the collapsing envelope that surrounds the central object.
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