Corrected diameter of galaxies: logdc

In RC2 apparent diameters were corrected for galactic extinction and inclination effect according to Heidmann & de Vaucouleurs (1972a,b,c). This question was later revisited after the result by Valentijn (1990, 1994) that galaxy disks may be opaque. The conclusion of Bottinelli et al. (1995) led to the following correction: where C=0.04, ag is the galactic extinction and Kd is given by Fouqué & Paturel (1985) as 0.094 for spiral galaxies and 0.081-0.016 t for early type galaxies with morphological type code t<0.

The D25 diameter and axis ratio are respectively given in the parameters logd25 and logr25 .