Abstract

RAGA, A. C. et al. Proper Motions of the HH 1 Jet. Rev. mex. astron. astrofis [online]. 2017, vol.53, n.2, 00021.  Epub Oct 21, 2019. ISSN 0185-1101.

We describe a new method for determining proper motions of extended objects, and a pipeline developed for the application of this method. We then apply this method to an analysis of four epochs of [S II] HST images of the HH 1 jet (covering a period of ≈ 20 yr). We determine the proper motions of the knots along the jet, and make a reconstruction of the past ejection velocity time-variability (assuming ballistic knot motions). This reconstruction shows an “acceleration” of the ejection velocities of the jet knots, with higher velocities at more recent times. This acceleration will result in an eventual merging of the knots in ≈ 450 yr and at a distance of ≈ 80′′ from the outflow source, close to the present-day position of HH 1.

Keywords : Herbig-Haro objects; ISM: jets and outflows; ISM: kinematics and dynamics; outflows; shock waves; stars: winds.

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