Abstract
On a identifie et etudie les etoiles RR Lyrae dans l'amas globulaire du GNM NGC 2257 et dans les 25' qui l'entourent. Dans l'amas on a identifie 16 nouvelles variables et dans le champ avoisinant 47 nouvelles variables. On n'a trouve aucune Cepheide. On a obtenu les periodes, les courbes de lumiere, les epoques du maximum, les temps de croissance et les magnitudes medianes et moyennes et on les compare a ceux des etoiles RR Lyrae galactiques
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