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Oxygen-rich disk in the V778 Cyg system resolved

Status Report From: arXiv.org e-Print archive
Posted: Saturday, April 23, 2005

Astrophysics, abstract
astro-ph/0504354

From: Ryszard Szczerba [view email]
Date: Fri, 15 Apr 2005 16:21:47 GMT   (51kb)
Oxygen-rich disk in the V778 Cyg system resolved
Authors: 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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