EDP Sciences
Free access
Issue
A&A
Volume 405, Number 1, July I 2003
Page(s) 189 - 198
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20030583


A&A 405, 189-198 (2003)
DOI: 10.1051/0004-6361:20030583

3D radiation hydrodynamics: Interacting photo-evaporating clumps

A. J. Lim1 and G. Mellema2

1  Dept. of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
2  Sterrewacht Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands
    e-mail: mellema@strw.leidenuniv.nl

(Received 16 December 2002 / Accepted 16 April 2003 )

Abstract
We present the results of a new radiation hydrodynamics code called Maartje. This code describes the evolution of a flow in three spatial dimensions using an adaptive mesh, and contains a combination of a ray tracer and an atomic physics module to describe the effects of ionizing radiation. The code is parallelized using a custom threadpool library. We present an application in which we follow the ionization of two dense spherical clumps which are exposed to an ionizing radiation field from a 50 000 K black body. We study various configurations in which one of the clumps shields the other from the ionizing photons. We find that relatively long-lived filamentary structures with narrow tails are formed. This raises the possibility that cometary knots (such as are found in the Helix Nebula) may be the result of the interaction of an ionizing radiation field with an ensemble of clumps, as opposed to the identification of a single knot with a single clump.


Key words: hydrodynamics -- radiative transfer -- ISM: kinematics and dynamics -- ISM: HII regions -- planetary nebulae: general

Offprint request: A. J. Lim, ajl@star.ucl.ac.uk

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