arXiv Open Access 2013

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

L. Origlia D. Massari R. M. Rich A. Mucciarelli F. R. Ferraro +2 lainnya

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Abstrak

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.

Topik & Kata Kunci

astro-ph.GA astro-ph.SR

Penulis (7)

L. Origlia

D. Massari

R. M. Rich

A. Mucciarelli

F. R. Ferraro

E. Dalessandro

B. Lanzoni

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Origlia, L., Massari, D., Rich, R.M., Mucciarelli, A., Ferraro, F.R., Dalessandro, E. et al. (2013). The Terzan 5 puzzle: discovery of a third, metal-poor component. https://arxiv.org/abs/1311.1706

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Tahun Terbit: 2013
Bahasa: en
Sumber Database: arXiv
Akses: Open Access ✓