LWS observations of the protostar IRAS16293-2422

Ceccarelli, C.; Caux, E.; White, G. J.; Molinari, S.; Furniss, I.; Liseau, R.; Nisini, B.; Saraceno, P.; Spinoglio, L. and Wolfire, M. (1998). LWS observations of the protostar IRAS16293-2422. In: Star Formation with the Infrared Space Observatory, 24-26 Jun 1997, Lisbon, Portugal.

URL: http://www.aspbooks.org/publications/132/243.pdf


We report ISO-LWS observations toward the low mass star IRAS16293-2422 between 43µm - 197µm. The CO, H2O and OH rotational lines and the OI(63µm) 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 · 104cm-3), temperature (~1500 K), and column density (~1.5 · 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 H2O and OH abundances derived from the observed line fluxes are [H2O] / [H2] ~2 · 10-5 and [OH] / [H2] ~5 · 10-6 respectively. Finally, we speculate that the OI(63µm) line emission originates in the collapsing envelope that surrounds the central object.

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