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

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arxiv 1311.1706 v1 pith:KLPDJKBR submitted 2013-11-07 astro-ph.GA astro-ph.SR

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

L. Origlia , D. Massari , R. M. Rich , A. Mucciarelli , F. R. Ferraro , E. Dalessandro , B. Lanzoni This is my paper
classification astro-ph.GA astro-ph.SR
keywords terzandiscoverymetal-poorstarsabundancealphaaveragebulge
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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.

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