The Hidden Potential of VVV RR Lyrae Light Curves

Gergely Hajdu, Márcio Catelan, István Dékány and Eva K. Grebel

We introduce a new method of determining the average magnitudes of RR Lyrae variables: in the K_S -band, based on robust fitting of principal components from a high-quality training sample; in the J-band, using the amplitudes of the K_S principal components to approximate the J-band light-curve shape in each pulsation phase. Furthermore, it has been found that the metallicity of individual RR Lyrae variables can be inferred from the K_S -band light curves.

Proceedings of the Polish Astronomical Society, vol. 6, 295-297 (2018)

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