Studies of Herbig-Haro objects with the Palomar adaptive optics system

Eric E. Bloemhof; Ben R. Oppenheimer; Richard G. Dekany; Mitchell Troy; Thomas L. Hayward; Bernhard Rainer Brandl

doi:10.1117/12.390380

7 July 2000 Studies of Herbig-Haro objects with the Palomar adaptive optics system

Eric E. Bloemhof, Ben R. Oppenheimer, Richard G. Dekany, Mitchell Troy, Thomas L. Hayward, Bernhard Rainer Brandl

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390380
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

Herbig-Haro objects are bright optical emission-line sources associated with tightly collimated jets ejected from pre-main- sequence stars. Only a few hundred are known. In optical images, they appear to be dense knots of material at the outer ends of the jets, and often exhibit streaming wake morphologies suggestive of bow shocks. Their optical spectra show characteristics of high-velocity shocks, with line-widths typically 100 km/s. HH objects often occur in pairs consistent with the bipolar morphology of outflows from YSOs; when radio maps of NH3 are made, high-density central regions consistent with collimating disks are seen. HH objects also often appear in a series along a jet, presumably where the jet undergoes a particularly energetic interaction with the ambient medium. Adaptively-corrected near-infrared studies of HH objects can reveal much about their workings at fine spatial scales. Narrow-band NIR filters sensitive to transitions of molecular hydrogen and other selected species are excellent tracers of shock excitation, and many HH objects have been observed to show complex structure in these lines down to the arc second level. By pushing to higher spatial resolution with adaptive optics, much more detailed information about the nature of the shock fronts may be obtained. In this paper we describe our first observations of HH objects with the AO system on the Palomar 200-inch telescope.

Citation Download Citation

Eric E. Bloemhof, Ben R. Oppenheimer, Richard G. Dekany, Mitchell Troy, Thomas L. Hayward, and Bernhard Rainer Brandl "Studies of Herbig-Haro objects with the Palomar adaptive optics system", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); https://doi.org/10.1117/12.390380

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