Multi-wavelength observations of the red giant R Doradus with the MAPPIT interferometer

Jacob, A. P.; Bedding, T. R.; Robertson, J. G.; Barton, J. R.; Haniff, C. A.; Marson, R. G.; Scholz, M.

Multi-wavelength observations of the red giant R Doradus with the MAPPIT interferometer

Authors

Description

We present visibility measurements of the nearby Mira-like star R Doradus taken over a wide range of wavelengths (650-990 nm). The observations were made using MAPPIT (Masked APerture-Plane Interference Telescope), an interferometer operating at the 3.9-m Anglo-Australian Telescope. We used a slit to mask the telescope aperture and prism to disperse the interference pattern in wavelength. We observed in R Dor strong decreases in visibility within the TiO absorption bands. The results are in general agreement with theory but differ in detail, suggesting that further work is needed to refine the theoretical models.
2 pages. Poster at IAU Symposium 205: Galaxies and their Constituents at the Highest Angular Resolutions, Manchester UK, August 2000. Proceedings to be published by ASP, edited by R. Schilizzi, S. Vogel, F. Paresce, M. Elvis