Abstract
The Galactic Oosterhoff dichotomy between Galactic globular clusters of type I (OoI) and type II (OoII) is often characterized by a difference in the period-amplitude (PA) relations displayed by RR Lyrae ab stars in each type of cluster. Classical examples of OoI and OoII are M3 and M15 respectively. Here we use multicolor data for the these two clusters to demonstrate how period-color (PC) relations at maximum V-band light are also different in OoI and OoII clusters.
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