STRUCTURE AND PROPER MOTIONS IN HERBIG-HARO OBJECT-1 AND OBJECT-2

We have carried out a detailed study on the structure and proper motions of the condensations in Herbig-Haro (HH) objects 1 and 2 and other HH objects in their immediate neighborhood. The presented proper motions are compatible with HH 1 being a bow shock, which is propagating into a moving medium ahead of it. They also reveal a very complex kinematical structure in HH 2. Proper motions for the nearby HH objects HH 144, HH 145, and the newly discovered KH 147 are presented and the probable outflow sources for HH 144 and HH 147 are identified. Tangential velocities in the range of 100-250 km s(-1) were measured for the condensations in I-III 2, III-I 144, and HH 147, while velocities of up to 380 km s(-1) were found in the HH 1 bow shock and in the jet pointing from the VLA1 source towards HH 1 (VLA1 jet). These outflows appear not to be well aligned with respect to each other, nor with the local cloud magnetic field. Linear correlations between tangential velocities and excitation and radial velocity dispersion, respectively, were found for condensations in HH 1 and 2. Surprisingly an anticorrelation between tangential velocity and radial velocity dispersion was found in the VLA1 jet. A deconvolved [S II] image of HH 1 (FWHM=0.''55) shows a wealth of structural details in the bow shock and (just) resolves the knots in the VLA1 jet, whose diameter could be measured. The deconvolved [8 II] image, as well as an Her image and the low tangential velocity suggest, that knot G(J) might consist of two closely spaced components, one of which is excited by the entrainment of ambient material into the VLA1 jet. Photometric monitoring between 1987 and 1993 shows that many of the brighter condensation in HH 1 and 2 were variable in the [S II]lambda lambda 6716,6731 lines. Most notable are the brightening of HH 2H by about 25%, the fading of HH 2C and G by about 20% and the strong variability of 10%-30% within only six years found for HH 1G, HH 2A', B, D, and G.