Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-11-22
Astron.Astrophys. 429 (2005) L37
Astronomy and Astrophysics
Astrophysics
5 pages, 2 figures. Accepted for pubblication in Astronomy & Astrophysics Letters (Table 1 will only appear in electronic form
Scientific paper
10.1051/0004-6361:200400110
We have assessed the influence of the stellar iron content on the Cepheid Period-Luminosity (PL) relation by relating the V band residuals from the Freedman et al (2001) PL relation to [Fe/H] for 37 Galactic and Magellanic Clouds Cepheids. The iron abundances were measured from FEROS and UVES high-resolution and high-signal to noise optical spectra. Our data indicate that the stars become fainter as metallicity increases, until a plateau or turnover point is reached at about solar metallicity. Our data are incompatible with both no dependence of the PL relation on iron abundance, and with the linearly decreasing behavior often found in the literature (e.g. Kennicutt et al 1998, Sakai et al 2004). On the other hand, non-linear theoretical models of Fiorentino et al (2002) provide a fairly good description of the data.
Bono Giuseppe
François Patrick
Groenewegen Martin
Mottini Marta
Primas Francesca
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