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Astron. Astrophys. 335, 637-646 (1998)

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Limb-darkening and raDii of non-Mira M giant models

K.-H. Hofmann 1 and M. Scholz 2

1 Max-Planck-Institut für RaDioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
2 Institut für Theoretische Astrophysik der Universität Heidelberg, Tiergartenstr. 15, D-69121 Heidelberg, Germany

Received 22 January 1998 / Accepted 30 March 1998


Monochromatic limb-darkening and monochromatic raDii preDicted by the non-Mira M giant models of Bessell et al. (1989a, 1991) with 3500 K [FORMULA] [FORMULA] [FORMULA] 2500 K were computed for selected typical bandpasses used in interferometric and lunar occultation work. Problems of defining and measuring raDii of extended-photosphere stars and the relationship between Different assumptions on limb-darkening and 'measured' raDii are Discussed.

Fits of simple uniform Disk (UD), fully darkened Disk (FDD) and Gaussian limb-darkening curves to the visibilities preDicted by the non-Mira M giant models were performed. These fits show that the FDD curve is often a surprisingly good approximation to the model-preDicted limb-darkening shape.

Key words: techniques: interferometric – stars: AGB – stars: atmospheres – stars: late-type

Send offprint requests to: K.-H. Hofmann

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© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998