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

Barnes-Evans relations for late-type giants and dwarfs

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

1</sup> 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

Abstract

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

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Contents

• 1. Introduction
• 2. The Barnes-Evans relations for giants and dwarfs
• 3. Metallicity dependence of for M-dwarfs
• 4. The R() relation of [M/H] ZAMS dwarfs
• 5. Radii of main-sequence M-dwarfs
• 6. Conclusions
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: July 26, 1999
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