1999AJ....117..456S

High spectral resolution long-slit spectra of HH 43 obtained in the 1-0 S(1) line of H₂ are reported. A direct image of HH 43 obtained in the 1-0 S(1) line of H₂ reveals a close correspondence with knots as seen in optical [S II] and Hα emission. We suggest that ambient molecular gas is being entrained and shocked by an atomic flow. The position-velocity diagram along the central axis of HH 43 as seen in H₂ reveals a sinusoidal-like structure with a semiamplitude of 8 km.s^–1 and a spatial wavelength of about 8000 AU. A direct Hα image of HH 43 shows evidence for a morphological wiggle with a semiamplitude of about 2" that has the same spatial wavelength and phase seen in the 8 km.s^–1 kinematic oscillation. These data suggest that HH 43 may be produced by a precessing jet in a close pre-main-sequence binary system. Possible system parameters are explored.