Resumen

TURNER, D. G. The usefulness of 2MASS JHK_s photometry for open cluster studies. Rev. mex. astron. astrofis [online]. 2011, vol.47, n.1, pp.127-137. ISSN 0185-1101.

2MASS JHK_s data are used to infer the reddening and distance of open clusters for which limited optical data are available. Intrinsic ZAMS color-color and color-magnitude relations are derived with reference to existing calibrations, standard stars, three uniformly-reddened clusters: Stock 16, NGC 2362, and NGC 2281, and unreddened Hyades dwarfs. The method of inferring interstellar reddening and distance for sparsely-populated open clusters is applied to Berkeley 44, Turner 1, and Collinder 419, for which existing results conflict with those inferred from JHK_s data. The last two clusters are of special interest: Turner 1 because it hosts the Galaxy's longest-period classical Cepheid, and Collinder 419 because it lies in the Cygnus X complex.

Palabras llave : dust; extinction; Galaxy [open clusters and associations]; general; Hertzsprung-Russell and C-M diagrams; methods [data analysis].

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