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

Abstract

We report on the discovery of 3 metal-poor giant stars in Terzan 5, a complex stellar 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 spectra obtained with NIRSPEC at Keck II, which confirm their radial velocity membership and provide average [Fe/H]=-0.79 dex iron abundance and [alpha/Fe]=+0.36 dex enhancement. This new population extends the metallicity range of Terzan~5 0.5 dex more metal poor, and it has properties consistent with having formed from a gas polluted by core collapse supernovae.

Accepted for publication on ApJ Letter

References in corpus (2)

• Near-IR properties of 24 Globular Clusters in the Galactic Bulge
• High resolution reddening map in the direction of the stellar system Terzan 5

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