The Hubble Space Telescope/WFC3 multiband photometry spanning from the UV to the near-IR of four fields in the Galactic bulge, together with that for six template globular and open clusters, are used to photometrically tag the metallicity [Fe/H] of stars in these fields after proper-motion reject...
Renzini, A.
,
Gennaro, M.
,
Zoccali, M.
,
Brown, T.M.
,
Anderson, J.
,
Minniti, D.
,
Sahu, K.C.
,
Valenti, E.
,
Vandenberg, D.A.
,
[The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity]
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The WFC3 Galactic Bulge Treasury Program: Relative Ages of Bulge Stars of High and Low Metallicity
We find two chemically distinct populations separated relatively cleanly in the [Fe/H]-[Mg/Fe] plane, but also distinguished in other chemical planes, among metal-poor stars (primarily with metallicities [Fe H] < -0.9) observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE...
Hayes, C.R.
,
Majewski, S.R.
,
Shetrone, M.
,
Fernández-Alvar, E.
,
Prieto, C.A.
,
Schuster, W.J.
,
Carigi, L.
,
Cunha, K.
,
Smith, V.V.
,
Sobeck, J.
,
Almeida, A.
,
Beers, T.C.
,
Carrera, R.
,
Fernández-Trincado, J.G.
,
García-Hernández, D.A.
,
Geisler, D.
,
Lane, R.R.
,
Lucatello, S.
,
Matthews, A.M.
,
Minniti, D.
,
Nitschelm, C.
,
Tang, B.
,
Tissera, P.B.
,
Zamora, O.
,
[Disentangling the Galactic Halo with APOGEE. I. Chemical and Kinematical Investigation of Distinct Metal-poor Populations]
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Disentangling the Galactic Halo with APOGEE. I. Chemical and Kinematical Investigation of Distinct Metal-poor Populations
We report the first estimate of the He abundance of the population of RR Lyrae stars in the Galactic bulge. This is done by comparing the recent observational data with the latest models. We use the large samples of ab-type RR Lyrae stars found by OGLE IV in the inner bulge and by the VVV survey ...
Marconi, M.
,
Minniti, D.
,
[Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars]
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Gauging the Helium Abundance of the Galactic Bulge RR Lyrae Stars