Stroemgren metallicity calibration: the m1, b-y relation
A. Calamida, G. Bono (OAR/INAF), P. B. Stetson (HIA/NRC), L. M., Freyhammer (Univ. Lancashire), S. Cassisi (OACTe/INAF), F. Grundahl (Aarhus, Univ.), A. Pietrinferni (OACTe/INAF), M. Hilker, F. Primas (ESO), T. Richtler, (Univ. Concepcion), M. Romaniello (ESO)
TL;DR
This paper introduces a new calibration method for the Stroemgren metallicity index m1 using the b-y color in cluster red giant stars, improving metallicity estimates.
Contribution
It presents a non-linear Metallicity-Index-Color relation that enhances the accuracy of iron abundance determinations for red giants.
Findings
Achieves ~0.25 dex accuracy in metallicity estimates.
Reveals non-linearity in the m1, b-y relation across the color range.
Provides a refined calibration for stellar metallicity analysis.
Abstract
We performed a new calibration of the Stroemgren metallicity index m1 based on the b-y color of cluster red giant stars. The current Metallicity-Index-Color relation is not linear in the color range 0.40 < b-y < 1.0, but provides iron abundances of cluster and field red giants with an accuracy of ~ 0.25 dex.
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Taxonomy
TopicsFatigue and fracture mechanics · Magnetic Properties and Applications · Microstructure and Mechanical Properties of Steels