K'-band polarimetric imaging of S187IR and S233

K'-band polarimetric images of star-forming regions S187 IR and S233 are pr esented. In S187 IR, a bipolar, near-infrared nebula is observed around IRA S 01202+6133, with the southern part being bright and knotty, and the north ern part being faint and filamentary. The polarization pattern shows that t he nebula is illuminated by a single near-infrared source, which is associa ted with IRAS 01202+6133. A polarization disk is found around this source w ith the disk plane roughly perpendicular to the axis of the bipolar nebula. We conclude that this source is the driving source of the outflow in the r egion. Two nebulae are detected in the S233 region. Associated with a compa ct infrared cluster, S233 A is roughly round in shape and shows a weak pola rization pattern. The S233 B nebula shows roughly elongated geometry in the east-west direction. The polarization vectors divide it into three parts. Each part has distinctly different polarization from the others. The northe astern part of S233 B exhibits a centrosymmetric polarization pattern aroun d a centroid, at which we locate a deeply embedded source (DES) undetected in the K' band and shorter wavelengths. The DES is likely the exciting sour ce of water masers and outflows in the S233 B region. The western part of t he nebula shows a parallel polarization pattern, but the southeastern part displays very little polarization. Comparison of the morphology and polariz ation of the nebulae in different star-forming regions suggests a close rel ationship between the evolutionary sequence of the young stellar objects an d the morphology of the associated nebulae.