Stroemgren metallicity calibration: the m1, b-y relation
astro-ph
/ Authors
A. Calamida, G. Bono, P. B. Stetson, L. M. Freyhammer, S. Cassisi, F. Grundahl, A. Pietrinferni, M. Hilker, F. Primas, T. Richtler
and 8 more authors
M. Romaniello, R. Buonanno, F. Caputo, M. Castellani, C. E. Corsi, I. Ferraro, G. Iannicola, L. Pulone
/ 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.