SIMBAD references

We compute passband-integrated specific intensities for spherically symmetric models generated with the PHOENIX code. The models cover the range 5000K≤T_eff≤10000K with surface gravities between 3.5 and 5.5, in steps of 0.5. The adopted mixing-length parameter is 2.0 pressure scale heights, while the microturbulent velocity is 2.0km/s. The calculations were carried out for four photometric systems: Stroemgren, Johnson, Geneva and Walraven, completing 24 filters. The series introduced by Claret (2000A&A...363.1081C) and a new bi-parametric (exponential) law are shown to be able to describe the intensity distribution of spherical models with acceptable σ. Simple limb-darkening laws do not produce accurate fits to the computed radiation fields. On the other hand, the concept of ``quasi'' spherical models is introduced and we present the corresponding limb-darkening coefficients for the most commonly adopted limb-darkening laws for the same filters.