Abstract
We have conducted spectrum analyses of 24 field metal-poor ([Fe/H] 30°) brighter than V = 15 exceeds those identified in extant objective-prism surveys by more than an order of magnitude. Finally, we deduce the effective temperature of the fundamental red edge of the metal-poor RR Lyrae instability strip, log Teff(FRE) = 3.80 ± 0.01, from the interface between the temperature distributions of metal-poor field RHB stars and the RR Lyrae stars of similar [Fe/H] in five metal-poor globular clusters.
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