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Astron. Astrophys. 335, 647-653 (1998)


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Very low mass stars: non-linearity of the limb-darkening laws *

A. Claret

Instituto de Astrofísica de Andalucía, CSIC, Apartado 3004, E-18080 Granada, Spain

Received 5 February 1998 / Accepted 27 March 1998

Abstract

Linear and non-linear limb-darkening coefficients for the photometric bands u v b y U B V R I J H K are computed for very low effective temperatures stars. The atmosphere models used (PHOENIX-NextGen) do not include the effects of dust formation and dust opacities. These calculations are presented for the first time. The calculations extend the range of effective temperatures (2000 K - 50000 K) covered by our previous papers. These data are important in order to deal with stars in the lower part of Main-Sequence like M or brown dwarfs. The non-linear behavior of the limb-darkening laws, particularly in this effective temperature range, is emphasized and we urge users to take it into account.

Key words: stars: atmospheres – stars: binaries: eclipsing – stars: low mass, brown dwarfs

* Tables 1-3 are available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/Abstract.html

Send offprint requests to: A. Claret, (Claret@iaa.es)

© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998

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