High-precision measurements of cool giant stars with the VLTI

Details High-precision measurements of cool giant stars with the VLTI High-precision measurements of cool giant stars with the VLTI

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..283..143r&link_type=abstract

In: Mass-losing pulsating stars and their circumstellar matter. Workshop, May 13-16, 2002, Sendai, Japan, edited by Y. Nakada, M

Astronomy and Astrophysics

Astrophysics

Cool Giants, Vlti

Scientific paper

We present first obervations of cool giant stars obtained at the ESO Very Large Telescope Interferometer (VLTI), both with two small test telescopes on a 16 m baseline, and by combining two 8 m telescopes on a 100 m baseline. In particular, we devote special attention to a study of Mira (ο Cet), with measurements clearly showing deviations from spherical symmetry and time variations. The VLTI will constitute an ideal instrument for such studies in the future. In particular it will permit detailed and accurate investigations of southern AGB stars, such as accurate measurements of surface structure parameters (diameters, diameter variations, asymmetries, center-to-limb variations, special features like hot spots) and of circumstellar envelopes.

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