1997A&A...326..373O -
Astronomy and Astrophysics, volume 326, 373-385 (1997/10-1)
IRAS 12553-7651 in Chamaeleon II: a low mass PMS star with a C18O outflow?
OLMI L., FELLI M. and CESARONI R.
Abstract (from CDS):
We present new multi-line, multi-isotope observations of the PMS candidate IRAS 12553-7651 in the nearby Chamaeleon II dark cloud. Previous far infrared and molecular observations towards three selected objects in Cha II determined that IRAS 12553-7651 was the most likely candidate to be a young (proto)stellar object. We thus mapped the IRAS 12553-7651 region in the
12CO J=2->1,
13CO J=2->1, and C
18O J=1->0 rotational transitions to use probes more sensitive to higher density gas and not affected by optical depth effects. We also observed and detected the C
34S J=2->1 transition. Our observations confirm the presence of a high-density clump at the position of the IRAS source with V
LSR≃3km/s, and reveal a C
18O velocity shift aligned along an axis SW-NE, of about 2km/s/pc, which is likely to be an outflow. Based upon this assumption, the
13CO spectra of Olmi et al. (
1994A&A...288..591O) have been re-analyzed and found to show a deviation from a Gaussian shape. This asymmetry can be interpreted in terms of a line component which migrates in velocity with respect to the ambient cloud. We show that a model in which the bipolar outflow interacts with the ambient gas around IRAS 12553-7651 may reproduce qualitatively the observational data.
Abstract Copyright:
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Journal keyword(s):
interstellar medium: clouds: individual: Chamaeleon II - interstellar medium: molecules - radio lines: interstellar
Simbad objects:
2
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