Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-16
Astronomy and Astrophysics
Astrophysics
3 pages, 2 figures; to appear in the PASP conference proceeding of the VLBA 10th Anniversary Meeting
Scientific paper
The OH main line masers in circumstellar shells were observed with astrometric VLBI in order to accurately determine the position of the star, as well as its motion, including the parallax. Results are presented on 4 Mira stars monitored for 2 - 8 years with the VLBA. The data show that in some stars the VLBI detection is dominated by blue-shifted emission that is associated with the stellar image amplified by the maser shell in front of the star. In other cases the maser is not directly tied to the stellar position, but still persistent enough to measure proper motion and parallax.
Diamond Phil
van Langevelde Huib Jan
Vlemmings Wouter
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