SCULPTING AN ASYMPTOTIC GIANT BRANCH MASS-LOSS ENVELOPE INTO A BIPOLAR PLANETARY NEBULA: HIGH-VELOCITY OUTFLOWS IN V HYDRAE
- Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Dr., Pasadena, CA 91109 (United States)
- Goucher College, 1021 Dulaney Valley Rd, Baltimore, MD 21204 (United States)
- National Optical Astronomy Observatory, P.O. Box 26732, Tucson, AZ 85726 (United States)
We have carried out high-resolution spectroscopic observations of the carbon star V Hya, covering the 4.6 {mu}m band of CO. These data, taken over seven 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{sup -1}, together with a slow-moving normal outflow at about 10 km s{sup -1}. Physical changes occur in the HV outflow regions on a timescale as short as 2 days, limiting their extent to be {approx}<10{sup 16} cm. The intrinsic line width for each HV component is quite large (6-8 km s{sup -1}) compared to the typical values ({approx}1 km s{sup -1}) appropriate for normal circumstellar envelopes (CSEs) of asymptotic giant branch stars, 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 modeled the absorption features to set constraints on the temperature distribution in, and the mass ejection rates for gas in the main HV components.
- OSTI ID:
- 21333770
- Journal Information:
- Astrophysical Journal, Vol. 699, Issue 2; Other Information: DOI: 10.1088/0004-637X/699/2/1015; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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