On the light curve-luminosity relation of RR lyrae stars

Géza Kovács, Johanna Jurcsik

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

We use a large sample of RRab stars in globular clusters and in the Sculptor dwarf galaxy to decipher the relation between the Fourier decomposition and the luminosity. For fixing the zero point of the relation, we use the latest Baade-Wesselink (BW) results. It is shown that the most plausible representation of the absolute brightness (in V color) consists of a linear expression of the period and of the Fourier parameters A1 and 31 (computed also from the V light curve). We derive an average Mv = α[Fe/H] + β relation from all the available Fourier data. Our results exclude any values of α larger than 0.19, in agreement with most of the BW and evolutionary studies. We give age and reddened distance modulus estimations for the clusters entering in our analysis.

Original languageEnglish
Pages (from-to)L17-L20
JournalAstrophysical Journal
Volume466
Issue number1 PART II
DOIs
Publication statusPublished - 1996

Keywords

  • Globular clusters: General
  • Stars: Abundances
  • Stars: Fundamental parameters
  • Stars: Horizontal-branch
  • Stars: Oscillations
  • Stars: Variables: Other (RR Lyrae)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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