On the Light Curve–Luminosity Relation of RR Lyrae Stars | Zendy

G. Kovács | Zendy; J. Jurcsik | Zendy

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On the Light Curve–Luminosity Relation of RR Lyrae Stars

Author(s) -

G. Kovács,

J. Jurcsik

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310160

Subject(s) - light curve , rr lyrae variable , globular cluster , astrophysics , luminosity , physics , stars , galaxy , fourier transform , brightness , fourier analysis , absolute magnitude , fourier series , variable star , apparent magnitude , astronomy , mathematics , mathematical analysis , quantum mechanics

We use a large sample of RRab stars in globular clusters and in the Sculptordwarf galaxy to decipher the relation between the Fourier decomposition and theluminosity. For fixing the zero point of the relation, we use the latestBaade-Wesselink (BW) results. It is shown that the most plausiblerepresentation of the absolute brightness (in V color) consists of a linearexpression of the period and of the Fourier parameters A_1 and Phi_31 (computedalso from the V light curve). We derive an average M_V = Alpha [Fe/H] + Betarelation from all the available Fourier data. Our results exclude any values ofAlpha larger than 0.19, in agreement with most of the BW and evolutionarystudies. We give age and reddened distance modulus estimations for the clustersentering in our analysis.Comment: 15 pages and 3 PostScript figure

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