2013ApJ...779L...5O

Query : 2013ApJ...779L...5O

2013ApJ...779L...5O - Astrophys. J., 779, L5 (2013/December-2)

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

ORIGLIA L., MASSARI D., RICH R.M., MUCCIARELLI A., FERRARO F.R., DALESSANDRO E. and LANZONI B.

Abstract (from CDS):

We report on the discovery of three metal-poor giant stars in Terzan 5, a complex stellar system in the Galactic bulge, known to have two populations at [Fe/H] = -0.25 and +0.3. For these three stars we present new echelle spectra obtained with NIRSPEC at Keck II, which confirm their radial velocity membership and provide an average [Fe/H] = -0.79 dex iron abundance and [α/Fe] = +0.36 dex enhancement. This new population extends the metallicity range of Terzan 5 to 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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Journal keyword(s): Galaxy: abundances - Galaxy: bulge - infrared: stars - stars: abundances - stars: late-type - techniques: spectroscopic

Nomenclature: Table 1: [OMR2013] NNN N=3 among (Nos 243, 262, 284).

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
2 2MASS J17480212-2447425 RG* 17 48 02.1176710723 -24 47 42.524304879           ~ 4 0
3 2MASS J17480468-2446210 RG* 17 48 04.6773778451 -24 46 20.563613457           ~ 4 0
4 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 948 1
5 [BH2018] J267.021042-24.775500 RG* 17 48 05.0568 -24 46 31.880           ~ 3 0
6 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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