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Improving the parallaxes of OH bearing Miras

Published online by Cambridge University Press:  01 March 2007

W. H. T. Vlemmings  and
H. J. van Langevelde
W. H. T. Vlemmings
Affiliation:
Argelander Institute for Astronomy, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany Jodrell Bank Observatory, Univ. of Manchester, Macclesfield, Cheshire SK11 9DL, U.K. email: [email protected]
H. J. van Langevelde
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA Dwingeloo, The Netherlands Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, The Netherlands
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Abstract

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We have carried out observations with the Very Long Baseline Array (VLBA) to measure the parallaxes of Mira variables and are able to improve the distance estimates significantly for a fraction of our sample (U Her, S CrB and RR Aql). This is predominantly because we have enhanced our technique by making use of nearby, in-beam calibrators. Additionally, the observing conditions have improved during the current solar minimum. The distances of these stars are of fundamental importance for studying the physical properties of Asymptotic Giant Branch (AGB) stars with high mass loss.

Keywords

astrometrystars: AGBmasers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 342 - 343
Copyright
Copyright © International Astronomical Union 2008

References

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