## 8. Discussion and conclusionsIn the present paper we have shown that there is a type dependence
in the zero-points of the diameter and also A concise summary of the main conclusions: - the type dependence may be seen as a zero-point shift, while the slope remains the same in the range 1 8, and especially in the range 2 6, to be used in the KLUN analysis
- the slope of the inverse diameter TF-relation is quite close to 0.5 as expected from the simple model, where the dark mass fraction is a constant; the slope of the inverse magnitude TF-relation is close to 0.1, also as expected from the same model
- as the main ingredient of the model is the de Vaucouleurs
exponential disc, we confirm that the bulge component does not
generally influence the determination of the photometric diameter at
the 25 mag (arcsec)
^{-2}level - it is concluded that the kinematical distance scale used to calculate linear diameters (and absolute magnitudes) is sufficiently good so that at constant calculated diameter the intrinsic variations in (mass) dominate
- we do not see evidence for a curvature in the TF-relations
- the zero-point shifts may be understood in terms of the disc + bulge + dark halo model, with reasonable ratios for the disc and bulge components
© European Southern Observatory (ESO) 1997 Online publication: July 3, 1998 |