DISCOVERY OF JETS AND HH-LIKE OBJECTS NEAR THE S255 IR COMPLEX

We report the discovery of two jets and eight HH-like objects in molec ular hydrogen near the Sharpless H II region S255 and present near-inf rared observations of these objects. The held has been imaged in [Fe I I] (1.644 mu m), cK (2.26 mu m), H-2 upsilon = 1 --> 0 S(1), and H-2 u psilon = 2 --> 1 S(1), as well as in broadband JHK' filters, as part o f an ongoing near-infrared survey of massive star-forming regions. The se observations reveal in detail the morphology of low and intermediat e-velocity shocks in the region. The HH-like objects are seen only in H-2. The brightest H-2 clump is found to the southwest of the S255 IR complex. We see evidence of one possible counterjet: a faint H-2 tail to the northeast of S255 IR, seen as a series of clumps. Their are-sha ped geometry is indicative of bow shocks. Diffuse emission is also see n in S255 IR, toward the north and south. K-band long-slit spectroscop y suggests a collisional nature for the brightest H-2 object rather th an fluorescence. These observations also indicate that the Br gamma ex cess present in S255 IR may be produced by the stellar wind of the ver y red star NIRS 1, while the H-2 diffuse emission may come from collis ionally shocked gas present in the extended nebulosity of the region. We also present the results of (CO)-C-12 (J = 1 --> 0) observations of the region. We find two foci of accelerated molecular gas, which sugg ests the presence of two molecular outflows, one associated with the u ltracompact H II region G192.58-0.04 and the other with the S255 IR re gion and one of the jets.