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Oxygen-rich disk in the V778 Cyg system resolved

By SpaceRef Editor
April 23, 2005
Filed under , ,

Astrophysics, abstract

From: Ryszard Szczerba [view email]
Date: Fri, 15 Apr 2005 16:21:47 GMT (51kb)

Oxygen-rich disk in the V778 Cyg system resolved

R. Szczerba,
M. Szymczak,
N. Babkovskaia,
J. Poutanen,
A. M. S. Richards,
M. A. T. Groenewegen

Comments: 4 pages, 3 figures, submitted to A&A Letters

The 22 GHz water maser emission from the silicate carbon star V778 Cyg has
been mapped using MERLIN with an astrometric accuracy of 25 mas. The maser
complex is displaced by about 190 mas from the position of the C-star measured
10 years previously. Our simulations show that this position difference is
unlikely to be due to proper motion if V778 Cyg is at the assumed distance of
1.4 kpc. The maser components form a distorted S-shaped structure extended over
about 18 mas along a position angle of -20 deg with a clear velocity gradient.
We argue that the observed water maser structure can be interpreted as an
O-rich disk around the secondary in the V778 Cyg binary system.

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