Deeply embedded objects and shocked molecular hydrogen: The environment of the FU Orionis stars RNO 1B/1C

Abstract

We present Spitzer IRAC and IRS observations of the dark cloud L1287. The mid-infrared (MIR) IRAC images show deeply embedded infrared sources in the vicinity of the FU Orionis objects RNO 1B and RNO 1C suggesting their association with a small young stellar cluster. For the first time we resolve the MIR point source associated with IRAS 00338+6312 which is a deeply embedded intermediate-mass protostar driving a known molecular outflow. The IRAC colors of all objects are consistent with young stars ranging from deeply embedded Class 0/I sources to Class II objects, part of which appear to be locally reddened. The two IRS spectra show strong absorption bands by ices and dust particles, confirming that the circumstellar environment around RNO 1B/1C has a high optical depth. Additional hydrogen emission lines from pure rotational transitions are superimposed on the spectra. Given the outflow direction, we attribute these emission lines to shocked gas in the molecular outflow powered by IRAS 00338+6312. The derived shock temperatures are in agreement with high velocity C-type shocks.

(1) Max Planck Institute for Astronomy, (2) SRON Netherlands Institute for Space Research (Groningen); accepted for publication in ApJ, 32 pages in preprint style including 4 tables and 11 figures (one of which is in color)

References in corpus (7)

• The absence of crystalline silicates in the diffuse interstellar medium
• The SMART Data Analysis Package for the Infrared Spectrograph on the Spitzer Space Telescope
• IRAC Observations of Taurus Pre-Main Sequence Stars
• ISO spectroscopy of gas and dust: from molecular clouds to protoplanetary disks
• Spitzer observations of HH54 and HH7-11: mapping the H2 ortho-to-para ratio in shocked molecular gas
• Infrared and Millimetric Study of the Young Outflow Cepheus E
• Molecular outflows around high-mass young stellar objects

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