Pietrukowicz, P; Udalski, A; Soszynski, I.; Nataf, David; Wyrzykowski, L; Poleski, R; Kozlowski, S; Szymanski, M; Kubiak, M; Pietrzysnki, G; Ulaczyk, K
We have analyzed the data on 16,836 RR Lyrae (RR Lyr) variables observed toward the Galactic bulge during the third phase of the Optical Gravitational Lensing Experiment (OGLE-III), which took place in 2001-2009. Using these standard candles, we show that the ratio of total-to-selective extinction toward the bulge is given by R I = A I /E(V - I) = 1.080 ± 0.007 and is independent of color. We demonstrate that the bulge RR Lyr stars form a metal-uniform population, slightly elongated in its...[Show more]
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