The RR Lyrae stars of ω Centauri revisited. I. Catalogue of Fourier decomposition parameters

Details The RR Lyrae stars of ω Centauri revisited. I. Catalogue of Fourier decomposition parameters The RR Lyrae stars of ω Centauri revisited. I. Catalogue of Fourier decomposition parameters

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..105..145p&link_type=abstract

Astronomy and Astrophysics Suppl. 105, 145-163 (1994)

Astronomy and Astrophysics

Astrophysics

10

Stars: Oscillations, Stars: Variables, Globular Clusters: {Omega} Cen

Scientific paper

Mean light curves of 56 RRc and 75 RRab variables in ω Cen published by Martin (1938) are used to calculate Fourier decomposition parameters of order N = 5 and 7 and their standard deviations. Besides the Fourier parameters our catalogue contains additional quantities describing the form of light curves. Calculation of the standard deviations is briefly described, and it is shown that these formal errors are also realistic error estimates in typical cases. For 30 stars detailed comparisons between Fourier parameters derived from mean light curves and from the original observations are performed. We find no significant difference between the calculated parameter values in the two types of reduction. This result allows safe use of a large amount of mean light curves published in the literature. A few problems in applications of Fourier parameters are briefly discussed. The physical meaning of the Fourier parameters is not clear. Several representations of the results of Fourier decomposition have been used in the literature. Since we find no convincing argument for preferring one specific representation, we recommend publication of results of Fourier analysis of light curves allowing a wide variety of light curve characteristics to be investigated.

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