Near- and mid-Infrared imaging study of young stellar objects around LkHα 234*

Eri Kato, Misato Fukagawa, Marshall D. Perrin, Hiroshi Shibai, Yusuke Itoh, Takafumi Ootsubo

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We present high-resolution (0:″2) near-infrared images of the area surrounding the Herbig Be star LkHα 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 LkHα 234 in detail. Eight young stellar object (YSO) candidates (Object B, C, D, E, F, G, NW1, and NW2) were detected at 2″-11″ from LkHα 234. Objects B and C are likely variable stars, which is consistent with a young evolutionary status. Three objects (LkHα 234, NW1, and NW2) were identified in the 11.8 μm (SiC) and 17.65 μm 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 LkHα 234, is the source illuminating the reflection nebula west of LkHα 234, although Object G may be another candidate. In our images, these objects are located at the center of the 2 μm 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 LkHα 234, and their proximity to LkHα 234 suggests that they may be its lower-mass companions.

Original languageEnglish
Pages (from-to)849-860
Number of pages12
JournalPublications of the Astronomical Society of Japan
Volume63
Issue number4
DOIs
Publication statusPublished - 2011 Aug 25

Keywords

  • ISM: Reflection nebulae
  • Infrared: Stars
  • Stars: Binaries: General
  • Stars: Pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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