Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-12-04
Astrophys.J.658:487-497,2007
Astronomy and Astrophysics
Astrophysics
(1) Max Planck Institute for Astronomy, (2) SRON Netherlands Institute for Space Research (Groningen); accepted for publicatio
Scientific paper
10.1086/511522
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.
Bouwman Jeroen
Henning Th
Lahuis Fred
Linz Hendrik
Quanz Sascha P.
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