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

doi:10.1088/2041-8205/779/1/L5

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

Astrophysics of Galaxies 2015-06-17 v1 Solar and Stellar Astrophysics

Authors: L. Origlia , D. Massari , R. M. Rich , A. Mucciarelli , F. R. Ferraro , E. Dalessandro , B. Lanzoni

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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.

Keywords

terzan 5 metal-poor stars galactic bulge stellar populations echelle spectra iron abundance core collapse supernovae

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@article{arxiv.1311.1706,
  title  = {The Terzan 5 puzzle: discovery of a third, metal-poor component},
  author = {L. Origlia and D. Massari and R. M. Rich and A. Mucciarelli and F. R. Ferraro and E. Dalessandro and B. Lanzoni},
  journal= {arXiv preprint arXiv:1311.1706},
  year   = {2015}
}

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Accepted for publication on ApJ Letter

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

Abstract

Keywords

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