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Astron. Astrophys. 348, 524-532 (1999)

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Barnes-Evans relations for late-type giants and dwarfs

K. Beuermann 1, I. Baraffe 2 and P. Hauschildt 3

1 Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany
2 C.R.A.L. (UMR 5574 CNRS), Ecole Normale Supérieure de Lyon, F-69364 Lyon Cedex 0.7, France
3 Department of Physics and Astronomy and Center for Simulational Physics, University of Georgia, Athens, GA 30602-2451, USA

Received 19 March 1999 / Accepted 18 June 1999


The visual surface brightness of K/M giants and dwarfs with near-solar metallicity differ slightly in agreement with the gravity effects predicted by recent theoretical models. We show that M-dwarfs display also a metallicity dependence of the surface brightness in the infrared K-band in agreement with theory. Based on these results, we present improved Barnes-Evans type relations and estimate the radii of 60 single or presumed M and K-dwarfs.

Key words: stars: abundances – stars: atmospheres – stars: late-type

Send offprint requests to: beuermann@uni-sw.gwdg.de

© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999