Theory and observations of a jet in the _ orionis region: HH 444
The discovery of a system of Herbig{Haro objects ejected by young, low massstars in the Orionis region (Reipurth et al. 1998) has given rise to models of thephotoionization of a neutral jet by an external source.We present long{slit spectra of high spectral resolution of HH 444 and nu-merical simula...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2001 |
| País: | México |
| Institución: | Universidad Nacional Autónoma de México |
| Repositorio: | Redalyc-UNAM |
| OAI Identifier: | oai:redalyc.org:57101018 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=57101018 |
| Access Level: | acceso abierto |
| Palabra clave: | Física, Astronomía y Matemáticas SHOCK WAVES HYDRODYNAMICS ISM: JETS AND OUTFLOWS TECHNIQUES: SPECTROSCOPIC ISM: INDIVIDUAL OBJECTS: HH 444 |
| Sumario: | The discovery of a system of Herbig{Haro objects ejected by young, low massstars in the Orionis region (Reipurth et al. 1998) has given rise to models of thephotoionization of a neutral jet by an external source.We present long{slit spectra of high spectral resolution of HH 444 and nu-merical simulations for this Herbig{Haro object using \yguazu", a 3D gasdynamic+radiative transfer code (Raga et al. 1999). We nd that a velocity prole in thejet beam is necessary to explain the observed accelaration in the position{velocitydiagram of the HH jet. We also need also assume a non{zero opening angle at thebase of the jet to explain the decreasing H intensity at increasing distances fromthe source and a variable ejection velocity to reproduce the well separated knotsobserved along the jet. |
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