The Cepheid Instability Strip in the GAIA Era

Details The Cepheid Instability Strip in the GAIA Era The Cepheid Instability Strip in the GAIA Era

2003-03-21

arxiv.org/abs/astro-ph/0303490v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures, to be published on ASP Conf. Series Vol. 298: "Gaia Spectroscopy, Science and Tecnology"

Scientific paper

We present recent results concerning distance determinations based on the two most popular primary distance indicators, namely classical Cepheids and RR Lyrae. We discuss the problems affecting the Cepheid distance scale, and in particular the dependence of fundamental Period-Luminosity (PL) and Period-Luminosity-Color (PLC) relations on the metal content. The key advantages in using the K-band PL relation of RR Lyrae stars when compared with the M_V vs [Fe/H] are also presented.

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