Study of the effect of metallicity on the amplitudes of Cepheids

Details Study of the effect of metallicity on the amplitudes of Cepheids Study of the effect of metallicity on the amplitudes of Cepheids

2007-05-15

arxiv.org/abs/0705.2138v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in Astronomische Nachrichten (Astronomical Notes). 4 pages, 5 figures

Scientific paper

10.1002/asna.200710802

Results concerning the dependence of photometric and radial velocity amplitudes on metallicity are presented based on about 200 Galactic classical Cepheids pulsating in the fundamental mode. The Galactic distribution of the [Fe/H] value of Cepheids is also studied. We show that the photometric amplitude ratio $A_\mathrm{I}/A_\mathrm{V}$ is independent of metallicity. The observed dependence of this ratio on the pulsation period does not correspond to the theoretical predictions.

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