High velocity bipolar outflow and disk-like envelope in the carbon star V Hya

Details High velocity bipolar outflow and disk-like envelope in the carbon star V Hya High velocity bipolar outflow and disk-like envelope in the carbon star V Hya

2004-07-16

arxiv.org/abs/astro-ph/0407337v1

Astrophys.J. 616 (2004) L43-L46

Astronomy and Astrophysics

Astrophysics

11 pages, 4 figures, accepted by the ApJL

Scientific paper

10.1086/424382

Using the partially completed Submillimeter Array with five antennas, we have observed the CO J=2-1 and 3-2 emission from the envelope surrounding the carbon star V Hya. The high-angular resolution (2"-4") maps show that V Hya is powering a bipolar molecular jet having an extreme velocity of 70-185 km/s. The axis of this high velocity jet is perpendicular to the major axis of the flattened disk-like envelope, which is expanding with a velocity of ~16 km/s.There is a third kinematic component, a medium-velocity wind having a deprojected velocity of 40-120 km/s moving along the disk plane. Both the high velocity jet and the medium velocity wind have a dynamical time scale of a few hundred years. The flattened structure and the collimated jet observed in V Hya suggests that the formation of asymmetrical structure proceeds while the central star is still in the AGB phase

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