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The properties of red clump giants in the central regions of the Galacticbulge are investigated in the photometric $Z$ and $Y$ bands of the infrared VVV(VISTA/ESO) survey and the [3.6],[4.5], [5.8] and [8.0] bands of the GLIMPSE(Spitzer/IRAC) Galactic plane survey. The absolute magnitudes for objects ofthis class have been determined in these bands for the first time: $M_{Z}=-0.20\pm0.04$ and $M_{Y}=-0.470\pm0.045$, $M_{[3.6]}= -1.70\pm0.03$,$M_{[4.5]}= -1.60\pm0.03$, $M_{[5.8]}= -1.67\pm0.03$ and $M_{[8.0]}=-1.70\pm0.03$. A comparison of the measured magnitudes with the predictions oftheoretical models for the spectra of the objects under study has demonstratedgood mutual agreement and has allowed some important constraints to be obtainedfor the properties of bulge red clump giants. In particular, a comparison withevolutionary tracks has shown that we are dealing predominantly with thehigh-metallicity subgroup of bulge red clump giants. Their metallicity isslightly higher than has been thought previously, $[M/H]\simeq0.40$ (${\bf Z}\simeq 0.038$) with an error of $[M/H]\simeq 0.1$ dex, while the effectivetemperature is $4250\pm150$ K. Stars with an age of 9-10 Gyr are shown todominate among the red clump giants, although some number of younger objectswith an age of $\sim8$ can also be present. In addition, the distances toseveral Galactic bulge regions have been measured, as D = 8200-8500 pc, and theextinction law in these directions is shown to differ noticeably from thestandard one.

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Determining the Absolute Magnitudes of Galactic-Bulge Red Clump Giants  in the Z and Y Filters of the Vista Sky Surveys and the IRAC Filters of the  Spitzer Sky Surveys