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- Title
A new visual - near-infrared diagnostic to estimate the metallicity of cluster and field dwarf stars.
- Authors
Calamida, A.; Monelli, M.; Milone, A. P.; Bono, G.; Pietrinferni, A.; Lagioia, E. P.
- Abstract
We present a theoretical calibration of a new metallicity diagnostic based on the Stromgren index m1 and on visual - near-infrared (NIR) colors to estimate the global metal abundance of cluster and field dwarf stars. To perform the metallicity calibration we adopt ar-enhanced evolutionary models transformed into the observational plane by using atmosphere models computed adopting the same chemical mixture. We apply the new visual-NW metallicity-index-color (MIC) relations to two different samples of field dwarfs and we find that the difference between photometric estimates and spectroscopic measurements is on average smaller than 0.1 dex, with a dispersion smaller than σ = 0.3 dex. We apply the same MIC relations to a metal-poor (M 92) and a metal-rich (47 Tuc) globular cluster. We find a peak of -2.01 ± 0.08 (σ = 0.30 dex) and -0.47 ± 0.01 (σ = 0.42 dex), respectively.
- Subjects
GLOBULAR clusters; DWARF stars; INFRARED astronomy; ASTRONOMICAL photometry; DISPERSION (Chemistry); CALIBRATION gases
- Publication
Astronomy & Astrophysics / Astronomie et Astrophysique, 2012, Vol 544, Issue 2, pA152-1
- ISSN
0004-6361
- Publication type
Article
- DOI
10.1051/0004-6361/201219712