High angular resolution CO mapping of the high velocity gas associated with HL/XZ Tau and V 645 Cygni (GL 2789)

Details High angular resolution CO mapping of the high velocity gas associated with HL/XZ Tau and V 645 Cygni (GL 2789) High angular resolution CO mapping of the high velocity gas associated with HL/XZ Tau and V 645 Cygni (GL 2789)

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177..171t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 171-176. Research supported by CIRIT de Catalunya.

Astronomy and Astrophysics

Astrophysics

36

Angular Resolution, Astronomical Maps, Carbon Monoxide, Gas Dynamics, Pre-Main Sequence Stars, High Speed, Mass Flow Rate, Molecular Clouds, Molecular Flow, Stellar Winds

Scientific paper

The authors have mapped the CO outflows associated with HL/XZ Tau and V645 Cygni with an angular resolution of 30arcsec. The blueshifted CO component associated with HL/XZ Tau appears to be located closer to XZ Tau than to HL Tau. This result together with theoretical considerations make doubtful the correctness of the previous indentification of HL Tau as the source of energy of the high velocity gas. This molecular outflow can also be created by a third heavily obscured star, or by a deflection of the large scale redshifted flow associated with L 1551-IRS 5. The authors resolved the apparent isotropic outflow associated with V645 Cygni into a bipolar outflow. The axis of the bipolar outflow at a scale of 15arcsec is oriented in the N-S direction, while at a scale of 1arcmin is oriented in the NW-SE direction. This change in direction can be explained by the existence of collimation processes working on different size scales, as it is suggested by the observed morphology of the ambient molecular cloud.

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