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Large stellar surveys of the Milky Way require validation with reference to aset of "benchmark" stars whose fundamental properties are well-determined. Formetal-poor benchmark stars, disagreement between spectroscopic andinterferometric effective temperatures has called the reliability of thetemperature scale into question. We present new interferometric measurements ofthree metal-poor benchmark stars, HD 140283, HD 122563, and HD 103095, fromwhich we determine their effective temperatures. The angular sizes of all thestars were determined from observations with the PAVO beam combiner at visiblewavelengths at the CHARA array, with additional observations of HD 103095 madewith the VEGA instrument, also at the CHARA array. Together withphotometrically derived bolometric fluxes, the angular diameters give a directmeasurement of the effective temperature. For HD 140283 we find {\theta}_LD =0.324+/-0.005 mas, Teff = 5787+/-48 K; for HD 122563, {\theta}_LD =0.926+/-0.011 mas, Teff = 4636+/-37 K; and for HD 103095 {\theta}_LD =0.595+/-0.007 mas, Teff = 5140+/-49 K. Our temperatures for HD 140283 and HD103095 are hotter than the previous interferometric measurements by 253 K and322 K, respectively. We find good agreement between our temperatures and recentspectroscopic and photometric estimates. We conclude some previousinterferometric measurements have been affected by systematic uncertaintieslarger than their quoted errors.

Accurate effective temperatures of the metal-poor benchmark stars HD 140283, HD 122563 and HD 103095 from CHARA interferometry