On the Theoretical Period-Luminosity Relation of Cepheids

Details On the Theoretical Period-Luminosity Relation of Cepheids On the Theoretical Period-Luminosity Relation of Cepheids

1998-01-26

arxiv.org/abs/astro-ph/9801242v1

Astronomy and Astrophysics

Astrophysics

11 pages, 3 figures, to appear in ApJ May 1, 1998 issue, Vol 498

Scientific paper

10.1086/305544

The theoretical period-luminosity relation for Cepheids was deduced from stellar evolution and pulsation computations. Questions concerning the metallicity dependence of the relation as well as the constancy of the pulsation `constant' Q in the instablility strip were addressed. We found no significant metallicity dependence of either the slope or of the zero-point of the period-luminosity relation. The Q-value, however, varies across the instability strip, in effective temperature as well as in luminosity; its metallicity dependence, on the other hand, is marginal.

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