A K' IMAGING SURVEY OF MOLECULAR OUTFLOW SOURCES

A K'-band imaging survey with a approximate to 8' x 3' field of view of all regions associated with CO molecular outflow from the list of Fukui (1989) has been conducted. We present the individual images and describe individual nebulous objects and star clusters. The data, including photometric calibration data, are being published as FITS files on a CD-ROM. The vast majority of all outflow sources are associated with nebulosity detectable in K', so such nebulae can be used as tracers for very young stars. We find a significant fraction (one-third) of molecular outflow sources to be associated with clusters of young stars. Most of the young embedded clusters show peaks in their K' magnitude histograms that, if interpreted as an evolutionary effect, indicate average ages of the embedded star population of <1 X 10(6) yr.