HST Images of the High-Excitation Herbig-Haro Object HH 32

Details HST Images of the High-Excitation Herbig-Haro Object HH 32 HST Images of the High-Excitation Herbig-Haro Object HH 32

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....114.2736c&link_type=abstract

Astronomical Journal v.114, p.2736

Astronomy and Astrophysics

Astronomy

18

Stars: Pre-Main Sequence, Stars: Individual: Hh 32, Stars: Formation

Scientific paper

We present high angular resolution emission-line and continuum images of the remarkable Herbig-Haro jet HH 32 obtained with the Wide Field and Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope. We have obtained narrow band [S ii] λλ6716,673l, [N ii] 6583 and Hα images, as well as an R continuum image, of this HH jet. The 0."l spatial resolution (corresponding to 30 AU at the distance of HH 32) and the high signal-to-noise ratio of these WFPC2 images allow us to study this highly collimated outflow in unprecedented detail. The images show differences between the stratification of the different emission lines. The knots are clearly resolved into complex structures that resemble working surfaces. The western side of the jet starts in a funnel-shaped structure that points toward the bright condensations HH 32D, 32B, and 32A, while on the other side of the jet the dominant structure is an arc-like feature that points almost directly away from the young star AS 353A. The HH 32A condensation exhibits a region strong in [S ii] that we identify as the Mach Disk at the tip of the jet. Finally, the HST images are used in combination with previous, high resolution ground based observations (obtained with the Canada-France-Hawaii telescope) to obtain proper motion determinations. We find that the kinematical properties deduced from these proper motions are consistent with those of a jet moving at about 300 km/s, penetrating into the maternal cloud at an angle of 70° between the outflow axis and the plane of the sky. This is also consistent with the properties deduced from previously obtained high resolution spectra of HH 32. We find that the kinematical properties deduced from these proper motions are completely consistent with previous proper motion measurements, as well as with the properties deduced from previously obtained, high resolution spectra of HH 32.

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