Abstract
Radial velocities determined from Fabry-Perot interferograms of the H II region complex composed of the small nebulae S 147, 148 and 149 are discussed. Large internal motions are exhibited in S 148 and S 149; the common velocity of the complex is -62 km/s from which the estimated kinematic distance is 4.3 kpc. S 148 is probably expanding at a rate of 8 km/s. The central star of S 148 shows a reddening of 0.4 magnitudes caused by the high dust content of this nebula. These results indicate that S 148 is probably a young object younger than S 147 and S 149. The nebular complex may therefore be another case where condensations within the same interstellar cloud are at different evolutionary stages.
