Astronomy and Astrophysics, volume 407, 237-248 (2003/8-3)
A molecular line survey of the candidate massive Class 0 protostar IRAS 23385+6053.
THOMPSON M.A. and MacDONALD G.H.
Abstract (from CDS):
We have carried out a molecular line survey of the candidate massive protostar IRAS 23385+6053
, covering a 27.2GHz frequency range in the 330-360GHz atmospheric window. We detected 27 lines originating from a total of 11 species. Over a third of the identified molecular lines are from the asymmetric top molecule methanol (CH3
OH). We did not detect any emission from high-excitation lines or typical hot core tracers (e.g. CH3
). We derive a rotation temperature and column density from the methanol emission and estimate lower limits to the beam-averaged column density of the remaining lines. Upper limits to the beam-averaged column density of selected species were determined from the non-detection of their rotation lines. We rule out the presence of a hot molecular core associated with IRAS 23385+6053 by a combination of the non-detection of CH3
CN emission and a simple bolometric luminosity approach. The molecular inventory and chemistry of IRAS 23385+6053 are contrasted to that of more evolved massive star-forming regions and the abundances predicted by recent time-dependent chemical models. The physical and chemical nature of IRAS 23385+6053
is shown to be consistent with that immediately prior to the hot molecular core stage.
ISM: abundances - ISM: individual object: IRAS 23385+6053 - ISM: molecules - stars: formation
Fig.1: Mol 160 VLA 1 and 2 = [MTR2002] Mol 160 VLA 1 and 2 in SIMBAD.
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