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We have carried out high-resolution spectroscopic observations of the carbonstar V Hya, covering the 4.6 micron band of CO. These data, taken over 7epochs, show that the circumstellar environment of V Hya consists of a complexhigh-velocity (HV) outflow containing at least six kinematic components withexpansion velocities ranging between 70 and 120 km/s, together with aslow-moving normal outflow at about 10 km/s. Physical changes occur in the HVoutflow regions on a time-scale as short as two days, limiting their extent to< ~ 10^{16} cm. The intrinsic line-width for each HV component is quite large(6-8 km/s) compared to the typical values (~1 km/s) appropriate for normal AGBcircumstellar envelopes (CSEs), due to excess turbulence and/or large velocitygradients resulting from the energetic interaction of the HV outflow with the VHya CSE. We have modelled the absorption features to set constraints on thetemperature distribution in, and the mass ejection-rates for gas in the main HVcomponents.

Sculpting an AGB Mass-Loss Envelope into a Bipolar Planetary Nebula: High-Velocity Outflows in V Hydrae