New limb-darkening coefficients and synthetic photometry for model-atmosphere grids at Galactic, LMC, and SMC abundances

TL;DR

This paper presents new model-atmosphere grids with updated physics for various chemical compositions, providing limb-darkening coefficients and synthetic photometry across multiple passbands, useful for stellar characterization.

Contribution

It introduces revised convection parameters and opacity functions for model grids at different metallicities, including LMC and SMC, with comprehensive limb-darkening and photometry data.

Findings

New limb-darkening coefficients for various compositions

Synthetic photometry across multiple passbands

Flux distributions for the updated models

Abstract

New grids of Atlas9 models have been calculated using revised convection parameters and updated opacity-distribution functions, for chemical compositions intended to be representative of solar, [M/H] = +0.3, +0.5, Large Magellanic Cloud (LMC), and Small Magellanic Cloud (SMC) abundances. The grids cover T(eff) = 3.5-50kK, from log(g) = 5.0 to the effective Eddington limit. Limb-darkening coefficients and synthetic photometry are presented in the UBVRIJHKLM, uvby, ugriz, WFCAM, Hipparcos/Tycho, and Kepler passbands for these models, and for Castelli's comparable `new-ODF' grids. Flux distributions are given for the new models. The sensitivity of limb-darkening coefficients to the adopted physics is illustrated.