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The Cepheid period-luminosity zero-point from Hipparcos trigonometrical parallaxes

M. W. Feast,R. M. Catchpole, Trigonometrical Parallaxes

Monthly Notices of the Royal Astronomical Society（1997）

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Abstract
Hipparcos trigonometrical parallaxes of Cepheid variables are used to derive a zero-point for the period-luminosity (PL) relation. Adopting a slope from the Large Magellanic Cloud (LMC), the relation is found to be 〈Mv>= -2.81 log P-1.43. The standard error of the zero-point is 0.10 mag. Together with metallicity corrections this corresponds to a distance modulus of 18.70 ± 0.10 for the LMC and 24...
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Key words
Cepheids,distance scale
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