Astrometry of circumstellar masers

Details Astrometry of circumstellar masers Astrometry of circumstellar masers

2002-08-16

arxiv.org/abs/astro-ph/0208317v1

Astronomy and Astrophysics

Astrophysics

8 pages, 2 figures, to appear in "Mass-losing Stars and their Circumstellar Matter", eds Y. Nakada & M. Honma, Kluwer ASSL ser

Scientific paper

The circumstellar masers around evolved stars offer an interesting possibility to measure stellar parameters through VLBI astrometry. In this paper the application of this technique is discussed, including the accuracy and the uncertainties of the method. The different maser species (OH, H_2O, SiO) have slightly different characteristics and applications. This paper does not concern astrometry of maser spots to study the kinematics of the envelope, but concentrates on attempting to measure the motion of the underlying star.

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