Proper Motions of Stellar Jets as Observed with HST: The Movies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Ism: Jets And Outflows, Stars: Mass Loss, Stars: Pre-Main Sequence

Scientific paper

The brightest stellar jets are close enough that they exhibit definite proper motions over a period of a few years when observed with the Hubble Space Telescope (HST). Results for the HH 1, HH 34, HH 47, and HH 111 jets, based on H alpha and [S II] HST images separated by about five years, are now available. A new interpolation algorithm for moving nebulae makes it possible to create images at intermediate times between the two epochs. The resulting movies make it much easier to follow photometric variations and shear motions than by simply blinking images taken at two epochs. Although the motion of the outflowing gas resembles ballistic motion in all cases, consistent with low shock velocities in a highly supersonic jet, the movies do show significant photometric variability and shear. This behavior is most evident in the H alpha images of working surfaces, where the shock structure is complex. Velocity and density variability in the jet is the most likely cause of the observed shock structures.

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