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:
log dc = logd25 - C . logr25 + ag . Kd
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
.