Metallicity estimates for double-mode cepheids from photometry

K. Sziládi, J. Vinkó, L. Szabados

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the effect of different metallicities on the light curve shape of classical double-mode (beat) Cepheids pulsating in the fundamental and first overtone modes by correlating the light curve Fourier parameters with [Fe/H] ratios. We combine data of known Galactic beat Cepheids with those from both Magellanic Clouds assembled by the OGLE-III and OGLE-IV surveys. The [Fe/H] values for the Galactic sample are based on recent high-resolution spectroscopy. For the Magellanic sample we apply the metallicity-period-period ratio relationship to estimate individual [Fe/H] values. We confirm that the metallicity is most strongly correlated with the amplitude of the light curve and the amplitude ratio of the first and second harmonics (R21 ), similar to single-mode classical Cepheids found by Klagyivik. We also show that the metallicity is less correlated with ϕ31 parameter in our sample, as compared with the case of the RR Lyr type variables. We derive empirical formulae that can be used to estimate the [Fe/H] of classical Cepheids that extends well below the metallicity of the Milky Way disk, down to the lower metallicities of the Magellanic Clouds.

Original languageEnglish
Pages (from-to)111-123
Number of pages13
JournalActa Astronomica
Volume68
Issue number2
Publication statusPublished - Jan 1 2018

Fingerprint

metallicity
photometry
estimates
light curve
Magellanic clouds
synchronism
spectroscopy
harmonics
parameter
high resolution
effect

Keywords

  • Stars: Abundances
  • Stars: Oscillations
  • Stars: Variables: Cepheids

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Metallicity estimates for double-mode cepheids from photometry. / Sziládi, K.; Vinkó, J.; Szabados, L.

In: Acta Astronomica, Vol. 68, No. 2, 01.01.2018, p. 111-123.

Research output: Contribution to journalArticle

@article{48634fe9af8f459ea6e7108964b720e0,
title = "Metallicity estimates for double-mode cepheids from photometry",
abstract = "We investigate the effect of different metallicities on the light curve shape of classical double-mode (beat) Cepheids pulsating in the fundamental and first overtone modes by correlating the light curve Fourier parameters with [Fe/H] ratios. We combine data of known Galactic beat Cepheids with those from both Magellanic Clouds assembled by the OGLE-III and OGLE-IV surveys. The [Fe/H] values for the Galactic sample are based on recent high-resolution spectroscopy. For the Magellanic sample we apply the metallicity-period-period ratio relationship to estimate individual [Fe/H] values. We confirm that the metallicity is most strongly correlated with the amplitude of the light curve and the amplitude ratio of the first and second harmonics (R21 ), similar to single-mode classical Cepheids found by Klagyivik. We also show that the metallicity is less correlated with ϕ31 parameter in our sample, as compared with the case of the RR Lyr type variables. We derive empirical formulae that can be used to estimate the [Fe/H] of classical Cepheids that extends well below the metallicity of the Milky Way disk, down to the lower metallicities of the Magellanic Clouds.",
keywords = "Stars: Abundances, Stars: Oscillations, Stars: Variables: Cepheids",
author = "K. Szil{\'a}di and J. Vink{\'o} and L. Szabados",
year = "2018",
month = "1",
day = "1",
language = "English",
volume = "68",
pages = "111--123",
journal = "Acta Astronomica",
issn = "0001-5237",
publisher = "Copernicus Foundation for Polish Astronomy",
number = "2",

}

TY - JOUR

T1 - Metallicity estimates for double-mode cepheids from photometry

AU - Sziládi, K.

AU - Vinkó, J.

AU - Szabados, L.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - We investigate the effect of different metallicities on the light curve shape of classical double-mode (beat) Cepheids pulsating in the fundamental and first overtone modes by correlating the light curve Fourier parameters with [Fe/H] ratios. We combine data of known Galactic beat Cepheids with those from both Magellanic Clouds assembled by the OGLE-III and OGLE-IV surveys. The [Fe/H] values for the Galactic sample are based on recent high-resolution spectroscopy. For the Magellanic sample we apply the metallicity-period-period ratio relationship to estimate individual [Fe/H] values. We confirm that the metallicity is most strongly correlated with the amplitude of the light curve and the amplitude ratio of the first and second harmonics (R21 ), similar to single-mode classical Cepheids found by Klagyivik. We also show that the metallicity is less correlated with ϕ31 parameter in our sample, as compared with the case of the RR Lyr type variables. We derive empirical formulae that can be used to estimate the [Fe/H] of classical Cepheids that extends well below the metallicity of the Milky Way disk, down to the lower metallicities of the Magellanic Clouds.

AB - We investigate the effect of different metallicities on the light curve shape of classical double-mode (beat) Cepheids pulsating in the fundamental and first overtone modes by correlating the light curve Fourier parameters with [Fe/H] ratios. We combine data of known Galactic beat Cepheids with those from both Magellanic Clouds assembled by the OGLE-III and OGLE-IV surveys. The [Fe/H] values for the Galactic sample are based on recent high-resolution spectroscopy. For the Magellanic sample we apply the metallicity-period-period ratio relationship to estimate individual [Fe/H] values. We confirm that the metallicity is most strongly correlated with the amplitude of the light curve and the amplitude ratio of the first and second harmonics (R21 ), similar to single-mode classical Cepheids found by Klagyivik. We also show that the metallicity is less correlated with ϕ31 parameter in our sample, as compared with the case of the RR Lyr type variables. We derive empirical formulae that can be used to estimate the [Fe/H] of classical Cepheids that extends well below the metallicity of the Milky Way disk, down to the lower metallicities of the Magellanic Clouds.

KW - Stars: Abundances

KW - Stars: Oscillations

KW - Stars: Variables: Cepheids

UR - http://www.scopus.com/inward/record.url?scp=85050148941&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85050148941&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:85050148941

VL - 68

SP - 111

EP - 123

JO - Acta Astronomica

JF - Acta Astronomica

SN - 0001-5237

IS - 2

ER -