An Empirical Tool to Derive Metallicity, Reddening, and Distance for Old Stellar Populations from Near‐Infrared Color‐Magnitude Diagrams | Zendy

F. R. Ferraro | Zendy; E. Valenti | Zendy; L. Origlia | Zendy

Open Access

An Empirical Tool to Derive Metallicity, Reddening, and Distance for Old Stellar Populations from Near‐Infrared Color‐Magnitude Diagrams

Author(s) -

F. R. Ferraro,

E. Valenti,

L. Origlia

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/506013

Subject(s) - metallicity , globular cluster , magnitude (astronomy) , physics , astrophysics , stellar population , galaxy , rgb color model , red giant branch , population , astronomy , star formation , computer science , artificial intelligence , demography , sociology

We present an empirical method to derive photometric metallicity, reddeningand distance to old stellar populations by using a few major features of theRed Giant Branch (RGB) in near IR color magnitude diagrams. We combine theobserved RGB features with a set of equations linking the global metallicity[M/H] to suitable RGB parameters (colors, magnitudes and slope), as calibratedfrom a homogeneous sample of Galactic Globular Clusters with differentmetallicities. This technique can be applied to efficiently derive the mainpopulation parameters of old stellar systems, in the view of using ground-basedadaptive optics and space facilities to probe the stellar content of remotegalaxies.Comment: 16 pages, 4 figures, accepted for pubblication on Ap

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