| THE ASTROPHYSICAL JOURNAL, 547 292301, 2001 January 20 (2007) | |||||||||||||
Abstract | |||||||||||||
| The two spectrometers on board the Infrared Space Observatory were used to observe the HerbigHaro objects HH 80, 81, and 80N, as well as their candidate exciting source IRAS 18162[2048. The ne structure lines of [O I]63km, [O I] 145 km, and [C II] 158 km are detected everywhere, while [N II] 122 km and [O III] 88.3 km are only detected toward the HH objects ; line ratios conrm for the rst time the collisionally excited HH nature of HH 80N. No molecular line is detected in any of the observed positions. We use a full shock code to diagnose shock velocities km s~1 toward the v HH objects, as expected from the optical spectroscopy. Since proper motions suggest velocities in excess of 600 km s~1, the HH objects probably represent the interface between two ow components with velocity di+ering by Aside from the ow exciting source, the [C II] 158 km line is everywhere Dv . | |||||||||||||
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