Studies of Cepheid type variability. II - Fourier description of RR Lyrae variables in the globular cluster Omega Centauri

Details Studies of Cepheid type variability. II - Fourier description of RR Lyrae variables in the globular cluster Omega Centauri Studies of Cepheid type variability. II - Fourier description of RR Lyrae variables in the globular cluster Omega Centauri

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..496p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 496-506.

Astronomy and Astrophysics

Astrophysics

44

Astronomical Photography, Cepheid Variables, Fourier Analysis, Globular Clusters, Light Curve, Stellar Oscillations, Amplitude Distribution Analysis, Phase Shift, Spectrum Analysis

Scientific paper

Photographic mean light curves for 75 RRab variables and 55 RRc variables in the globular cluster ω Centauri are Fourier analysed. A discussion of the low order amplitude ratios and phase differences show good agreement with similar results for field RR Lyrae stars. The first overtone RRc variables in ω Cen show clear systematic changes in Fourier parameters with period. It is suggested that these changes can be interpreted as a bump progression sequence probably of a new type. It is noted that the long period RRab variables in ω Cen do not share the unique pulsation properties of the small-amplitude variable XZ Ceti recently discussed by Simon and Teays. Evidence is shown to exist for a Cepheid-like progression in the fundamental mode variables in ω Cen from periods about 0d.5 through the RRab region towards the resonance expected for periods about 1d.5. A quantitative comparison of the progression sequences in Type I and II Cepheids is attempted with some success.

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