IRAS 12553-7651 in Chamaeleon II: a low mass PMS star with a C^18^O outflow?

Details IRAS 12553-7651 in Chamaeleon II: a low mass PMS star with a C^18^O outflow? IRAS 12553-7651 in Chamaeleon II: a low mass PMS star with a C^18^O outflow?

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326..373o&link_type=abstract

Astronomy and Astrophysics, v.326, p.373-385

Astronomy and Astrophysics

Astrophysics

6

Interstellar Medium: Clouds: Individual: Chamaeleon Ii, Interstellar Medium: Molecules, Radio Lines: Interstellar

Scientific paper

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 ^12^CO J=2->1, ^13^CO J=2->1, and C^18^O 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^34^S 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^18^O 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 ^13^CO 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.

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