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We report on the discovery of 3 metal-poor giant stars in Terzan 5, a complexstellar system in the the Galactic bulge, known to have two populations at[Fe/H]=-0.25 and +0.3. For these 3 stars we present new echelle spectraobtained with NIRSPEC at Keck II, which confirm their radial velocitymembership and provide average [Fe/H]=-0.79 dex iron abundance and[alpha/Fe]=+0.36 dex enhancement. This new population extends the metallicityrange of Terzan~5 0.5 dex more metal poor, and it has properties consistentwith having formed from a gas polluted by core collapse supernovae.

The Terzan 5 puzzle: discovery of a third, metal-poor component