... sample

The table of the Appendix and Table 3 are available in electronic form at CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/383/398, and on our anonymous ftp-server www-obs.univ-lyon1.fr (pub/base/CEPHEIDES.tar.gz).

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... relation

This method was first introduced to solve the same kind of problems for the Tully-Fisher relation (1977).

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... used

Lanoix et al. give eight classes of light curves: "Normal'', "Symetrical'', "Bumpy'', "Scattered'', "Overtone'', "Low amplitude'', "Peculiar'', "No curve''. A "Normal'' light curve is characterized by a non-symetrical variation: a fast increase and a slower decrease.

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... galaxies

IC4182, NGC3368, NGC3627, NGC4496A, NGC4536, NGC4639 and NGC5253.

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... Cepheids

This value corresponds to a ratio of total-to-selective absorption A_V / (A_V - A_I)= R_V / (R_V - R_I) = 2.45.

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...$b_{\rm v}=-1.021$

GFG give $b_{\rm v}=-4.058$ because they consider the zero-point at $\log P =1$.

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...1999)

Note that we kept 720 normal Cepheids among the 1182 available with $\log P > 0.5$.

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