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

We have carried out a detailed study on the structure and proper motio ns of the condensations in Herbig-Haro (HH) objects 1 and 2 and other HH objects in their immediate neighborhood. The presented proper motio ns are compatible with HH 1 being a bow shock, which is propagating in to a moving medium ahead of it. They also reveal a very complex kinema tical structure in HH 2. Proper motions for the nearby HH objects HH 1 44, HH 145, and the newly discovered KH 147 are presented and the prob able 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 cond ensations 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 n ot to be well aligned with respect to each other, nor with the local c loud magnetic field. Linear correlations between tangential velocities and excitation and radial velocity dispersion, respectively, were fou nd for condensations in HH 1 and 2. Surprisingly an anticorrelation be tween 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 deconvol ved [8 II] image, as well as an Her image and the low tangential veloc ity suggest, that knot G(J) might consist of two closely spaced compon ents, one of which is excited by the entrainment of ambient material i nto the VLA1 jet. Photometric monitoring between 1987 and 1993 shows t hat many of the brighter condensation in HH 1 and 2 were variable in t he [S II]lambda lambda 6716,6731 lines. Most notable are the brighteni ng of HH 2H by about 25%, the fading of HH 2C and G by about 20% and t he strong variability of 10%-30% within only six years found for HH 1G , HH 2A', B, D, and G.