Beat Cepheids as probes of stellar and galactic metallicity

J. Robert Buchler, R. Szabó

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The mere location of a beat Cepheid model in a period ratio versus period diagram (Petersen diagram) puts very tight constraints on its metallicity Z. The beat Cepheid Petersen diagrams are revisited with linear nonadiabatic turbulent convective models, and their accuracy as a probe for stellar metallicity is evaluated. They are shown to be largely independent of the helium content Y, and they are also only weakly dependent on the mass-luminosity relation that is used in their construction. However, they are found to show sensitivity to the relative abundances of the elements that are lumped into the metallicity parameter Z. Rotation is estimated to have but a small effect on the "pulsation metallicities." A composite Petersen diagram is presented that allows one to read off upper and lower limits on the metallicity Z from the measured period P0 and period ratio P10.

Original languageEnglish
Pages (from-to)723-731
Number of pages9
JournalAstrophysical Journal
Volume660
Issue number1 I
DOIs
Publication statusPublished - May 1 2007

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metallicity
synchronism
diagram
probe
diagrams
probes
helium
relative abundance
luminosity
composite materials
sensitivity

Keywords

  • Cepheids
  • Galaxies: abundances
  • Stars: oscillations (including pulsations)
  • Stars: rotation

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Space and Planetary Science

Cite this

Beat Cepheids as probes of stellar and galactic metallicity. / Robert Buchler, J.; Szabó, R.

In: Astrophysical Journal, Vol. 660, No. 1 I, 01.05.2007, p. 723-731.

Research output: Contribution to journalArticle

Robert Buchler, J. ; Szabó, R. / Beat Cepheids as probes of stellar and galactic metallicity. In: Astrophysical Journal. 2007 ; Vol. 660, No. 1 I. pp. 723-731.
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