Stellar positions from SiO masers in the Galactic center

Details Stellar positions from SiO masers in the Galactic center Stellar positions from SiO masers in the Galactic center

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...339..897s&link_type=abstract

Astronomy and Astrophysics, v.339, p.897-903 (1998)

Astronomy and Astrophysics

Astrophysics

10

Techniques: Interferometric, Astrometry, Stars: Kinematics, Stars: Agb And Post-Agb, Galaxy: Kinematics And Dynamics

Scientific paper

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 s({) -1} in 5 years.

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