The Kinematics of Knots along Herbig-Haro Jets at High Spatial Resolution

Details The Kinematics of Knots along Herbig-Haro Jets at High Spatial Resolution The Kinematics of Knots along Herbig-Haro Jets at High Spatial Resolution

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8277r&link_type=abstract

HST Proposal ID #8277

Computer Science

Hst Proposal Id #8277 Stellar Ejecta

Scientific paper

Since the beginning of this decade, it has been speculated that the aligned knots of Herbig-Haro {HH} jets may correspond to "internal working surfaces" resulting from a time-dependent ejection velocity. This interpretation has received substantial support from recent HST images of some HH jets, which show that at least some knots do have morphologies that resemble internal working surfaces. However, the principal signatures of a jet with a time-dependent ejection velocity are kinematic, having a systematic spatial velocity variability {with spatial variations over distances comparable to the knot sizes} along the jet beam. Given the fact that the knots have typical sizes {along the jet axis} of 0.5" and knot separations of 2", the spatially resolved kinematic characteristics within the knots can only be observed with HST. We propose to obtain STIS spectra of one very well studied HH jet: HH 111. HST images have shown that some of the knots along this jet show the bow shock morphology expected from internal working surface models. The proposed spectroscopic observations will provide the kinematical information necessary for a clear confirmation of the identification of the knots along the HH 111 jet as internal working surfaces.

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