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

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 P1/P0 shows strong correlation with their derived [Fe/H] values. The corresponding period ratio -- metallicity relation has been evaluated.

10 pages, 7 figures, accepted in A&A

References in corpus (2)

• High resolution spectroscopy for Cepheids distance determination. I. Line asymmetry
• Detection of Beat Cepheids in M33 and Their Use as a Probe of the M33 Metallicity Distribution

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• The influence of metallicity on the Leavitt Law from geometrical distances of Milky Way and Magellanic Clouds Cepheids
• Tracing the Milky Way warp and spiral arms with classical Cepheids
• Chemical evolution of disc galaxies from cosmological simulations
• The CoRoT discovery of a unique triple-mode cepheid in the galaxy
• Double Mode Cepheids from the Zwicky Transient Facility Survey