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Eri Kato, Misato Fukagawa, Marshall D. Perrin, Hiroshi Shibai, Yusuke Itoh, Takafumi Ootsubo, Near- and Mid-Infrared Imaging Study of Young Stellar Objects around LkHα 234, Publications of the Astronomical Society of Japan, Volume 63, Issue 4, 25 August 2011, Pages 849–860, https://doi.org/10.1093/pasj/63.4.849
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Abstract
We present high-resolution (0|$''\!\!\!.$|2) near-infrared images of the area surrounding the Herbig Be star LkH|$\alpha $| 234 taken with the Coronagraphic Imager with Adaptive Optics (CIAO) and the adaptive optics on the Subaru Telescope. The near-infrared (|$J$|, |$H$|, |$K$|, |$L'$|, and |$M'$| bands) images reveal circumstellar structures around LkH|$\alpha $| 234 in detail. Eight young stellar object (YSO) candidates (Object B, C, D, E, F, G, NW1, and NW2) were detected at 2|$\arcsec$|–11|$\arcsec$| from LkH|$\alpha $| 234. Objects B and C are likely variable stars, which is consistent with a young evolutionary status. Three objects (LkH|$\alpha $| 234, NW1, and NW2) were identified in the 11.8|$\ \mu$|m (SiC) and 17.65|$\ \mu$|m images obtained with the Long Wavelength Spectrometer (LWS) on the Keck Telescope. NW1 and NW2 are thought to be embedded young stars. We suggest that NW1, and not LkH|$\alpha $| 234, is the source illuminating the reflection nebula west of LkH|$\alpha $| 234, although Object G may be another candidate. In our images, these objects are located at the center of the 2|$\ \mu$|m polarization, and NW1 resides at the center of a monopolar cavity. The SED of NW1 suggests that it is a YSO with a spectral type of B6–B7. Object F and G were discovered by our observations at 1|$''\!\!\!.$|9 and 2|$''\!\!\!.$|3, respectively, from LkH|$\alpha $| 234, and their proximity to LkH|$\alpha $| 234 suggests that they may be its lower-mass companions.
