Precession of collimated outflows from young stellar objects

We consider several protostellar systems in which either a precessing jet o r at least two misaligned jets have been observed. We assume that the prece ssion of jets is caused by tidal interactions in noncoplanar binary systems . For Cep E, V1331 Cyg, and RNO 15-FIR,.the inferred orbital separations an d disk radii are in the range 4-160 AU and 1-80 AU, respectively, consisten t with those expected for pre-main-sequence stars. Furthermore, we assume o r use the fact that the source of misaligned outflows is a binary and evalu ate the length scale over which the jets should precess as a result of tida l interactions. For T Tau, HH1 VLA 1/2, and HH 24 SVS63, it may be possible to detect a bending of the jets rather than "wiggling." In III-I III IRS a nd L1551 IRS5, wiggling may be detected on the current observed scale. Our results are consistent with the existence of noncoplanar binary systems in which tidal interactions induce jets to precess.