Limb-darkening and raDii of non-Mira M giant models
K.-H. Hofmann 1 and
M. Scholz 2
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 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
© European Southern Observatory (ESO) 1998
Online publication: June 18, 1998