EDP Sciences
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Volume 376, Number 3, September IV 2001
Page(s) 1073 - 1079
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20011052

A&A 376, 1073-1079 (2001)
DOI: 10.1051/0004-6361:20011052

Optically thick Herbig-Haro jets in photoionized regions

E. Masciadri1 and A. C. Raga2

1  Instituto de Astronomía, UNAM, Apartado Postal 70-264, 04510 D. F., México
    e-mail: masciadri@astroscu.unam.mx
2  Instituto de Ciencias Nucleares, UNAM, Apartado Postal 70-543, 04510 D. F., México

(Received 23 May 2001 / Accepted 16 July 2001 )

Over the last few years, a number of Herbig-Haro (HH) jets have been discovered within the confines of H II regions. These jets apparently are ejected from low mass stars that are similar to the sources of other "normal" HH jets, but the flows show some special characteristics which are a result of the photoionization due to the ionizing photons emitted by the star that excites the H II region. In this paper, we present HH jet models including an external, photoionizing radiation field, and study the effects of increasing ionizing photon fluxes F* on the structure of the head of the jet. We find that the morphology, the emission line fluxes and the line ratios change drastically as a function of increasing F*. These results give general guidelines for deciding whether an HH jet actually does lie within an H II region, based on the morphology and spectroscopic characteristics of the object.

Key words: ISM: HH objects -- hydrodynamics -- methods: numerical

Offprint request: E. Masciadri, elena@astroscu.unam.mx

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