
doi: 10.1086/162084
On a mesure l'indice ΔS de l'abondance en metaux pour les etoiles RR Lyrae de neuf amas globulaires. Il y a une bonne correlation entre ΔS et l'indice de temperature de la branche des geantes (V-K) 0 GB. Les abondances ΔS de 26 amas globulaires ont ete utilisees pour re-etalonner l'indice de Zinn Q 39 en fonction de [Fe/H]. On a determine les valeurs de [Fe/H] pour 55 amas globulaires, soit a partir de ΔS, soit a partir des indices Q 39 corriges
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