Near- and Mid-Infrared Imaging Study of Young Stellar Objects around LkHα 234

We present high-resolution (0: 2) near-infrared images of the area surrounding the Herbig Be star LkH˛ 234 taken with the Coronagraphic Imager with Adaptive Optics (CIAO) and the adaptive optics on the Subaru Telescope. The near-infrared (J , H , K, L 0 ,a ndM 0 bands) images reveal circumstellar structures around LkH˛ 234 in detail. Eight young stellar object (YSO) candidates (Object B, C, D, E, F, G, NW1, and NW2) were detected at 2 00 –11 00 from LkH˛ 234. Objects B and C are likely variable stars, which is consistent with a young evolutionary status. Three objects (LkH˛ 234, NW1, and NW2) were identified in the 11.8 � m (SiC) and 17.65 � m images obtained with the Long Wavelength Spectrometer (LWS) on the Keck Telescope. NW1 and NW2 are thought to be embedded young stars. We suggest that NW1, and not LkH˛ 234, is the source illuminating the reflection nebula west of LkH˛ 234, although Object G may be another candidate. In our images, these objects are located at the center of the 2 � m polarization, and NW1 resides at the center of a monopolar cavity. The SED of NW1 suggests that it is a YSO with a spectral type of B6–B7. Object F and G were discovered by our observations at 1: 00 9a nd 2: 00 3, respectively, from LkH˛ 234, and their proximity to LkH˛ 234 suggests that they may be its lower-mass companions.