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                              G C N E W S
                             * Newsflash *

            - The Newsletter for Galactic Center Research -

gcnews@mpifr-bonn.mpg.de             http://www.mpifr-bonn.mpg.de/gcnews
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Vol. 9, No. 10                                              Nov 25, 1998


Recently submitted papers:
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Email    : sjouwerman@jive.nfra.nl
Title    : Stellar positions from SiO masers in the Galactic center
Author(s): Lorant O. Sjouwerman(1,2,3), Huib Jan van     
           Langevelde(3), Philip J. Diamond(4)
Institute: (1) Onsala Rymdobservatorium, S - 439 92 Onsala, Sweden      
           (2) Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The   
             Netherlands (3) Joint Institute for VLBI in Europe,   
              P.O. Box 2, 7990 AA Dwingeloo, The Netherlands
           (4) N.R.A.O. Array Operations Center, P.O. Box 0, Socorro NM     
           87801, U.S.A.
Paper    : Astronomy and Astrophysics, in press
Weblink  : http://www.nfra.nl/jive/jive/preprints/pre_pub.html

Abstract:
We report on the possibility of determining milli-arcsecond accurate
positions (relative to Sgr A*) for 43 GHz SiO masers located at the
Galactic center. The SiO masers were found in OH/IR stars in a
previous Very Large Array survey. We used the Very Long Baseline Array
and the phased Very Large Array in a phase-referencing scheme with a
cycle time of 40 seconds. The continuum source Sgr A* is used as
phase-reference source. Because of the atmospheric phase instability
at 43 GHz and sensitivity considerations, only 2 sources (from 10)
were detected.  However, we show that reliable positions can be
obtained with calculable errors, which allows one to measure the
proper motion of these stars accurate to ~30 km/sec in 5 years.
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			       Edited by
Angela Cotera                                Heino Falcke
(cotera@ipac.caltech.edu)                    (hfalcke@mpifr-bonn.mpg.de)
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