Bibcode
Diaz-Cordoves, J.; Gimenez, A.; Claret, A.
Bibliographical reference
Astronomy and Astrophysics Supplement, v.110, p.329
Advertised on:
4
1995
Citations
282
Refereed citations
264
Description
Linear, quadratic, and square root limb-darkening coefficients have been
computed by means of least squares fits to model atmospheres by Kurucz
(1991) with the main purpose of facilitating the analysis of light
curves of eclipsing binaries. Results are compared with previously
published values using the same or different models and various fitting
procedures. The linear limb-darkening coefficients were found to be
quite sensitive to the method adopted for the fit of the model
atmosphere. We also found that the best analytical approximation to the
actual effect of limb-darkening is highly dependent on the effective
temperature. The depth of the convective region defines in fact
important changes in the behaviour of the intensity surface distribution
and, e.g., for the hotter stars the square root approximation introduced
in a previous paper (D iaz-Cordoves & Gimenez 1992) provided the
best fit. Integrated limb-darkening coefficients were calculated for the
Stroemgren uvby and Johnson's UBV photometric bands for all the models
available, and a simple expression for the interpolation of linear
limb-darkening values is given together with the corresponding
coefficients for the different photometric bands.