Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-09-18
Astron.Astrophys. 395 (2002) 573-585
Astronomy and Astrophysics
Astrophysics
Scientific paper
10.1051/0004-6361:20021334
We report ISO-LWS far infrared observations of CO, water and oxygen lines towards the protobinary system IRAS4 in the NGC1333 cloud. We detected several water, OH, CO rotational lines, and two [OI] and [CII] fine structure lines. Given the relatively poor spectral and spatial resolution of these observations, assessing the origin of the observed emission is not straightforward. In this paper, we focus on the water line emission and explore the hypothesis that it originates in the envelopes that surround the two protostars, IRAS4 A and B, thanks to an accurate model. The model reproduces quite well the observed water line fluxes, predicting a density profile, mass accretion rate, central mass, and water abundance profile in agreement with previous works. We hence conclude that the emission from the envelopes is a viable explanation for the observed water emission, although we cannot totally rule out the alternative that the observed water emission originates in the outflow.
Castets Alain
Caux Emmanuel
Ceccarelli Cecilia
Maret Sebastian
Tielens Alexander G. G. M.
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