We have begun developing a new metallicity calibration for RR Lyrae stars that includes high-temperature phase regions .
Our calibration is an updated and expanded version of the Delta-S , equivalent width method , but which is applicable for most phases of the pulsation , and for the hotter , shorter-period RRc stars .
This calibration will be constructed from spectral observations of well studied , bright RR Lyrae stars with metallicities from published high-resolution studies , within the range -2.5 < [ Fe / H ] < -0.3 .
Phase information for our calibration stars were taken from the AAVSO website , and the MacAdam Student Observatory at the University of Kentucky .
Low-resolution spectroscopy ( R \sim 1000 ) was obtained using the McDonald Observatory , 2.1 meter telescope .
Here we present our preliminary data , and find the phase region where the calibration will break down .