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Fourier Coefficients of OGLE Variables. IV. RR Lyr Stars in ω Cen and towards 47 Tuc

Morgan S. M., Dickerson C.

Acta Astronomica

2000

Vol. 50, No. 2

249--268

Fourier coefficients for RR Lyr stars found by the OGLE survey in ω Cen and in the direction of 47 Tuc are presented. A total of 180 light curves were examined. Physical parameters for the stars including mass, luminosity, effective temperature and metallicity were derived using theoretical relations based upon the Fourier coefficients. The well known metallicity variation is seen in the ω Cen RR Lyr variables. The distance modulus to ω Cen is estimated to be ⟨m-M⟩=13.73±0.07 mag, while the RR Lyr stars seen in the direction of 47 Tuc are located in the Small Magellanic Cloud, and have an estimated distance modulus of ⟨m-M⟩=18.78±0.08 mag.