High-Velocity Bipolar Outflow and Disklike Envelope in the Carbon Star V Hydrae
- 28 October 2004
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 616 (1), L43-L46
- https://doi.org/10.1086/424382
Abstract
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 with an extreme velocity of 70-185 km s-1. The axis of this high-velocity jet is perpendicular to the major axis of the flattened disklike envelope, which is expanding with a velocity of ~16 km s-1. There is a third kinematic component, a medium-velocity wind with a deprojected velocity of 40-120 km s-1 moving along the disk plane. Both the high-velocity jet and the medium-velocity wind have a dynamical timescale of a few hundred years. The flattened structure and the collimated jet observed in V Hya suggest that the formation of asymmetrical structure proceeds while the central star is still in the asymptotic giant branch phase.Keywords
This publication has 13 references indexed in Scilit:
- The Submillimeter ArrayThe Astrophysical Journal, 2004
- Physical Structure of the Protoplanetary Nebula CRL 618. II. Interferometric Mapping of Millimeter‐Wavelength HCNJ= 1–0, HCO+J= 1–0, and Continuum EmissionThe Astrophysical Journal, 2004
- A collimated, high-speed outflow from the dying star V HydraeNature, 2003
- Evidence for Rapid Rotation of the Carbon Star V HydraeThe Astrophysical Journal, 1995
- The relational database and calibration software for the Caltech millimeter arrayPublications of the Astronomical Society of the Pacific, 1993
- The dust content of evolved circumstellar envelopes and the optical properties of dust at submillimeter to radio wavelengthsThe Astrophysical Journal Supplement Series, 1993
- Jet formation in the transition from the asymptotic giant branch to planetary nebulaeThe Astrophysical Journal, 1992
- A VLA 3.6 centimeter survey of N-type carbon starsThe Astrophysical Journal, 1992
- Optical spectroscopy of the Jet in V HydraeMonthly Notices of the Royal Astronomical Society, 1991
- Mechanisms for mass loss from cool starsPublications of the Astronomical Society of the Pacific, 1987