The fountains of youth: Irradiated breakout of outflows in S140

We present a wide-field CCD survey of Herbig-Haro objects in the S140 H II region and the adjacent molecular cloud. Two outflows originating in the S140 molecular cloud core are breaking into the surrounding H II region. The P.A. = 65degrees/245degrees molecular outflow that originates from IRS 3 in the S140 infrared cluster has driven an optically visible bow shock into the S140 H II region. This externally irradiated shock, HH 617, appears to be the counterflow associated with an H-2-bright bow shock located 90 northeast of S140 IRS 3. A second, even larger bow shock, HH 616, located about 1' south of this shock indicates another major outflow whose as yet unidentified driving source must lie south of the S140 infrared cluster. These observations indicate that additional molecular outflows and embedded young stars remain to be identified in the S140 molecular cloud core. Furthermore, we report the detection of a dozen new Herbig-Haro objects in other cloud cores near S140.