Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-05-04
Astrophys.J.699:1015-1023,2009
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
33 pages, 6 figures
Scientific paper
10.1088/0004-637X/699/2/1015
We have carried out high-resolution spectroscopic observations of the carbon star V Hya, covering the 4.6 micron band of CO. These data, taken over 7 epochs, show that the circumstellar environment of V Hya consists of a complex high-velocity (HV) outflow containing at least six kinematic components with expansion velocities ranging between 70 and 120 km/s, together with a slow-moving normal outflow at about 10 km/s. Physical changes occur in the HV outflow 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 AGB circumstellar envelopes (CSEs), due to excess turbulence and/or large velocity gradients resulting from the energetic interaction of the HV outflow with the V Hya CSE. We have modelled the absorption features to set constraints on the temperature distribution in, and the mass ejection-rates for gas in the main HV components.
Hinkle Kenneth
Sahai Raghvendra
Sugerman Ben E. K.
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