[Fe/H] relations for c-type RR Lyrae variables based upon Fourier coefficients |
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Authors: | Siobahn M Morgan Jennifer N Wahl Rachel M Wieckhorst |
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Institution: | Department of Earth Science, University of Northern Iowa, Cedar Falls, IA 50614-0335, USA |
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Abstract: | Fe/H]–φ31– P relations are found for c-type RR Lyrae stars in globular clusters. The relations are analogous to that found by Jurcsik & Kovács for field ab-type RR Lyrae stars, where a longer period correlates with lower metallicity values for similar values of the Fourier coefficient φ31. The relations obtained here are used to determine the metallicity of field c-type RR Lyrae stars, those within ω Cen, the Large Magellanic Cloud and toward the galactic bulge. The results are found to compare favourably to metallicity values obtained elsewhere. |
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Keywords: | stars: abundances stars: variables: other globular clusters: general |
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