ISOTOPIC CO IMAGES NEAR THE YOUNG TRIPLE STAR GSS-30

We present synthesized images of gas and dust associated with the near by, low-mass core GSS 30, in the J = 1-0 line of (CO)-C-12-O-18 and (C O)-C-13-O-16, and in 2.7 mm continuum emission. We detected a flattene d core roughly orthogonal to the major axis of the bipolar infrared re flection nebula. The core has a mass of about 0.5 M(.) and size of 30' ' x 20''. The molecular gas in the core forms a 2400 AU shell expandin g at a speed of 0.7 km s(-1). This region seems to represent a dense c ore disrupted by an episode of star formation in the recent past. The 2.7 mm continuum emission is detected toward the youngest component, I RS 3 (LFAM 1), of the three embedded sources. The continuum source rem ains unresolved at 8.''9 x 4.''16 resolution. The deconvolved size of 5'' sets an upper limit of 800 AU on the size of circumstellar materia l. Molecular gas emission does not peak at any of the known infrared s ources. This suggests that the dust and gas may not evolve simultaneou sly in the star-forming cores.