New homogeneous iron abundances of double-mode Cepheids from high-resolution echelle spectroscopy

K. Sziládi, J. Vinkó, E. Poretti, L. Szabados, M. Kun

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Aims. We define the relationship between the double-mode pulsation of Cepheids and metallicity in a more accurate way, determine the empirical metallicities of double-mode Cepheids from homogeneous, high-resolution spectroscopic data, and study of the period-ratio - metallicity dependence. Methods. The high S/N echelle spectra obtained with the FEROS spectrograph were analyzed using a self-developed IRAF script, and the iron abundances were determined by comparing with synthetic spectra assuming LTE. Results. Accurate [Fe/H] values of 17 galactic beat Cepheids were determined. All these stars have solar or slightly subsolar metallicity. Their period ratio (P 1/P0) shows strong correlation with their derived [Fe/H] values. The corresponding period ratio - metallicity relation has been evaluated.

Original languageEnglish
Pages (from-to)579-587
Number of pages9
JournalAstronomy and Astrophysics
Volume473
Issue number2
DOIs
Publication statusPublished - Oct 1 2007

Keywords

  • Stars: atmospheres
  • Stars: general
  • Stars: variables: Cepheids

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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