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A COMPARATIVE STUDY OF MORPHOLOGY AND VELOCITY FIELD OF THE EMISSION NEBULAE S153, S207, S211, AND A71

Data on five small, roundish (dimension 2-5 arcmin) H II regions are presented: S153, S207, S211, S212, and A71. The data consist of images through narrow-band interference filters and Fabry-Perot interferograms yielding velocities over the face of the objects. Similarities in the morphological details of these objects are examined, particularly those in their ringlike outer filaments. The velocity field of the first four nebulae is consistent with an overall expansion (3-4 km/s). A71, with a striking resemblance to S207, is not a planetary but an H II region.