Kinematics of the HH 43 flow: Evidence for a precessing jet?

High spectral resolution long-slit spectra of HH 43 obtained in the 1-0 S(1 ) line of H-2 are reported. A direct image of HH 43 obtained in the 1-0 S(1 ) line of H-2 reveals a close correspondence with knots as seen in optical [S II] and H alpha emission. We suggest that ambient molecular gas is being entrained and shocked by an atomic flow. The position-velocity diagram alo ng the central axis of HH 43 as seen in PI, reveals a sinusoidal-like struc ture with a semiamplitude of 8 km s(-1) and a spatial wavelength of about 8 000 AU. A direct H alpha image of HH 43 shows evidence for a morphological wiggle with a semiamplitude of about 2 " that has the same spatial waveleng th and phase seen in the 8 km s(-1) kinematic oscillation. These data sugge st that HH 43 may be produced by a precessing jet in a close pre-main-seque nce binary system. Possible system parameters are explored.