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Published online by Cambridge University Press: 12 April 2016
I have recently prepared for publication a study of 100 field RR Lyraes which were measured on the u, k, b, y, β system described by Jones (1971). It is shown that the following indices
β1 = β − 0.125(k − b) + 0.103(b−y)
(u − b)3 = (u − b) − 0.93(b − y) − 0.62(k − b) − 1.95(β − 2.75)
(k − b)2 = (k − b) − 0.826(b − y) + 0.25(β − 2.75)
correlate strongly with θeff, logg and [Fe/H] respectively. Figures in that paper show the tightness of the correlations.