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The distance to the LMC cluster Reticulum from the K-band Period-Luminosity-Metallicity relation of RR Lyrae stars

M. Dall'ora·J. Storm·G. Bono·V. Ripepi·M. Monelli·V. Testa·G. Andreuzzi·R. Buonanno·F. Caputo·V. Castellani·C. E. Corsi·G. Marconi·M. Marconi·L. Pulone·P. B. Stetson
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Abstract

We present new and accurate Near-Infrared J and Ks-band data of the Large Magellanic Cloud cluster Reticulum. Data were collected with SOFI available at NTT and covering an area of approximately (5 x 5) arcmin^2 around the center of the cluster. Current data allowed us to derive accurate mean K-band magnitudes for 21 fundamental and 9 first overtone RR Lyrae stars. On the basis of the semi-empirical K-band Period-Luminosity-Metallicity relation we have recently derived, we find that the absolute distance to this cluster is 18.52 +- 0.005 (random) +- 0.117 (systematic). Note that the current error budget is dominated by systematic uncertainty affecting the absolute zero-point calibration and the metallicity scale.

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M. Dall'ora, J. Storm, G. Bono, V. Ripepi, M. Monelli, V. Testa, G. Andreuzzi, R. Buonanno, F. Caputo, V. Castellani, C. E. Corsi, G. Marconi, M. Marconi, L. Pulone, P. B. Stetson. 2004-04-05. The distance to the LMC cluster Reticulum from the K-band Period-Luminosity-Metallicity relation of RR Lyrae stars. https://doi.org/10.1086/421513

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