Faculty Publications

Title

Fourier coefficients of OGLE variables. IV. RR Lyr stars in ω Cen and towards 47 Tuc

Document Type

Article

Keywords

Stars: fundamental parameters, Stars: oscillations, Stars: variables: RR Lyr

Journal/Book/Conference Title

Acta Astronomica

Volume

50

Issue

2

First Page

249

Last Page

268

Abstract

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.

Original Publication Date

12-1-2000

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