The infrared JHK light curves of RR Lyr
A. Sollima, C. Cacciari, A.A. Arkharov, V.M. Larionov, D.L. Gorshanov,, N.V. Efimova, A. Piersimoni
TL;DR
This paper provides the first complete infrared JHK light curves of RR Lyr, enabling improved calibration of its properties and distance measurements to the LMC globular cluster Reticulum.
Contribution
It presents the first accurate infrared light curves of RR Lyr, refining its physical parameters and the calibration of the P-L_K-[Fe/H] relation for distance estimation.
Findings
Mean magnitudes in JHK bands are precisely measured.
Infrared data improve the calibration of the P-L_K-[Fe/H] relation.
Distance modulus to Reticulum is estimated as 18.48 +/- 0.11.
Abstract
We present infrared JHK time series photometry of the variable star RR Lyr, that allow us to construct the first complete and accurate infrared light curves for this star. The derived mean magnitudes are <J>=6.74 +/- 0.02, <H>=6.60 +/- 0.03 and <K>=6.50 +/- 0.02. The <K> magnitude is used to estimate the reddening, the mass, the mean luminosity and temperature of this variable star. The use of these RR Lyr data provide a more accurate absolute calibration of the P-L_K-[Fe/H] relation, and a distance modulus (m-M)_0=18.48 +/- 0.11 to the globular cluster Reticulum in the LMC.
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