Abstract

We report observations of the southern Bok globule BHR 71 in the J = 1 ? 0 and J = 2 ? 1 lines of 12CO, the J = 1 ? 0 lines of 13CO and C 18O, and (J, K) = (1, 1) and (2, 2) inversion lines of NH 3 made with angular resolution of ?20? to ?9?. We also report 1.3 mm continuum observations made with SEST with ?20? resolution. The low angular resolution molecular observations indicate that the globule has a diameter of ?0.5 pc, a kinetic temperature of 11 K, a total mass of ?40 M ?, and an average molecular density of ?9 × 10 3 cm -3. The high angular resolution observations reveal the presence, near the center of the globule, of a highly collimated bipolar outflow with lobes extending by ?0.3 pc in opposite directions from a strong 1.3 mm continuum source. The morphology and velocity structure of the flow is found to be well described by a biconical outflow that is inclined from the line of sight at an angle of ?84°, has a semi-opening angle of 15°, and in which the gas moves outward with an approximate constant radial velocity (with respect to the cone apex) of ?28 km s -1. The outflow appears to be driven by a very young stellar object with L bol ? 9 L ?, whose characteristics at infrared and millimeter wavelengths are similar to those of the so-called Class 0 sources. © 1997. The American Astronomical Society. All rights reserved.