Determination of the iron content of cepheids from the shape of their light curves

P. Klagyivik, L. Szabados, A. Szing, S. Leccia, N. Mowlavi

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9 Citations (Scopus)

Abstract

We present the study of the metallicity dependence of the Fourier amplitude ratios R21 and R31 for the light curves of short-period Galactic classical Cepheids in B, V, RC and IC bands. Based on the available photometric and spectroscopic data, we determined the relations between the atmospheric iron abundance, [Fe/H], and the Fourier parameters. Using these relations we calculated the photometric [Fe/H] values of all programme Cepheids with an average accuracy of ±0.15 dex. No spectroscopic iron abundance was known before for 14 of these stars. These empirical results provide an alternate method to determine the iron abundance of classical Cepheids too faint for spectroscopic observations. We also checked whether the metal-poor Cepheids of bothMagellanic Clouds follow the same relationships, and a good agreement was found.

Original languageEnglish
Pages (from-to)2418-2425
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume434
Issue number3
DOIs
Publication statusPublished - Sep 1 2013

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Keywords

  • Abundances-Stars
  • Asteroseismology-Stars
  • Cepheids
  • Variables

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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