Complex investigations of an active star formation region in the southern part of Mon R2

ABSTRACT We continue to present the results of a Byurakan Narrow Band Imaging Survey (BNBIS). In this work, we present the results of the search and further detailed investigation of the objects, found in the course of the BNBIS survey in the southern part of the Mon R2 (Monoceros R2) association. For the search of Herbig–Haro (HH) objects, the narrow-band images, obtained with the 1 m Schmidt telescope of the Byurakan Observatory, were used. Newly found objects were imaged in optical and near-infrared (IR) range with the Apache Point Observatory 3.5 m telescope, and observed spectrally with a long-slit spectrograph and scanning Fabry–Perot interferometer on a 6 m telescope of Special Astrophysical Observatory of the Russian Academy of Sciences using SCORPIO-2 (Spectral Camera with Optical Reducer for Photometrical and Interferometrical Observations – 2). We found three new HH groups: HH 1233, HH 1234, and HH 1235, two of them represent extended collimated flows. HH 1233 is the C-shape bipolar outflow system associated with the 2MASS 06084223−0657385 source star. HH 1234 is the helical chain of HH knots near the star V963 Mon. HH 1235 is a separate compact knot, connected with the visible only in mid- and far-IR source WISE J060856.57−070103.5. We also found several molecular hydrogen outflows, one of which coincides with HH 1233 and two other are associated with the deeply embedded IR sources in the same field. One more probable bipolar H2 outflow is related to WISE J060856.57−070103.5. The emission spectra and spectral energy distributions of the source stars were analysed. According to them they should be under a rather early evolutional stage.