Physical and Chemical Structure of the Solar Type Protostar NGC1333-IRAS4

Details Physical and Chemical Structure of the Solar Type Protostar NGC1333-IRAS4 Physical and Chemical Structure of the Solar Type Protostar NGC1333-IRAS4

2002-12-18

arxiv.org/abs/astro-ph/0212402v2

Astrophys.Space Sci. 281 (2002) 139-140

Astronomy and Astrophysics

Astrophysics

Proceedings of the conference "The Evolution of Galaxies. II- Basic Building Blocks", Ile de la reunion, France, 16-21 October

Scientific paper

10.1023/A:1019564031796

Sun like stars are born from the collapse of fragment of molecular clouds. During the first embedded phase (the so called class 0/1), the protostar is surrounded by a collapsing envelope, whose physical and chemical structure would set up the initial conditions of the proto-stellar disk which may eventually form planets. In this contribution, we show how spectroscopic far infrared to millimeter observations can be a powerful diagnostic to derive the chemical and physical structure of the innermost regions of envelopes collapsing around solar type protostars, where disk are believe to form. Our claim is based on the simultaneous modeling of the dynamics, chemistry and radiative transfer in a protostellar envelope. Here we present a study of a class 0 protostar NGC1333-IRAS4, obtained using ISO-LWS observations of water far-infrared lines. We show the derived physical and chemical structure of the protostar, namely the density and temperature profiles, as well as the water abundance across the envelope. Besides, the mass of the central protostar and its accretion rate can be constrained by these observations and modeling, yielding an alternative method to measure these two poorly know parameters.

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