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Astron. Astrophys. 326, 318-328

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A 200 km s-1 molecular wind in the peculiar carbon star V Hya

G.R. Knapp1, A. Jorissen1,*, and K. Young2,**

1 Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA (gk@astro.princeton.edu, ajorisse@astro.ulb.ac.be)
2 Caltech Submillimeter Observatory, P.O. Box 4339, Hilo, HI 96720, USA (rtm@dolson.harvard.edu)

Received 12 November 1996 / Accepted 1 April 1997


A molecular wind with an outflow speed in excess of 200 km s-1 has been found in the AGB carbon star VHya. Observations of several molecular lines show that the circumstellar envelope is expanding at 15 km s-1 and is flattened and inclined to the line of sight. The fast wind appears to be expanding from the poles of the envelope, with the expansion speed increasing with distance from the star. VHya may be in the very earliest stage of evolution beyond the AGB.

Key words: stars: carbon - stars: individual - stars: mass-loss - stars: AGB and post-AGB

*On leave from Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles
**Present address: Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138

© European Southern Observatory (ESO) 1997

Online publication: September 9, 1997
Last change: April 20, 1998