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

Details Limb-darkening and radii of non-Mira M giant models Limb-darkening and radii of non-Mira M giant models

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..637h&link_type=abstract

Astronomy and Astrophysics, v.335, p.637-646 (1998)

Astronomy and Astrophysics

Astrophysics

30

Techniques: Interferometric, Stars: Agb, Stars: Atmospheres, Stars: Late-Type

Scientific paper

Monochromatic limb-darkening and monochromatic radii predicted by the non-Mira M giant models of Bessell et al. (1989a, 1991) with 3500 K >= Teff >= 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.

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