Metallicity of clusters from RRab pulsators: results of an automatic analysis

Details Metallicity of clusters from RRab pulsators: results of an automatic analysis Metallicity of clusters from RRab pulsators: results of an automatic analysis

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.300..251s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 1, pp. 251-256.

Astronomy and Astrophysics

Astronomy

14

Methods: Data Analysis, Stars: Oscillations, Globular Clusters: General, Globular Clusters: Individual: M3, Globular Clusters: Individual: M5, Globular Clusters: Individual: Omega Cen

Scientific paper

We apply the photometric method of Jurcsik & Kovacs to newly available observations of RRab pulsators in clusters, in order to determine such physical properties as metallicity [Fe/H] and absolute magnitudes M_V. For this purpose we devised a fully automatic algorithm for reliable and repeatable determination of Fourier parameters from light curves without resorting to smoothing and/or interpolation, employed in the past. In this way we demonstrate that these parameters form solid foundations for the method of Jurcsik & Kovacs. Whether these parameters lead to reliable determination of [Fe/H] and M_V for RRab stars, as postulated by Jurcsik & Kovacs, still remains an open question. Our photometric average cluster metallicities <[Fe/H]>_phot for M3, M5, M68, omega Cen and NGC 288 correlate reasonably well with their spectroscopic determinations <[Fe/H]>_sp, supporting Jurcsik & Kovacs. However, for individual RRab stars in omega Cen we were not able to reproduce expected correlations between (i.e. M_V), <[Fe/H]>_phot and <[Fe/H]>_sp. As chemical composition in omega Cen is known to vary, the existence of such correlations is expected.

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