Browsing by Author "San Roman, I."

Now showing 1 - 5 of 5
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    Stellar populations of galaxies in the ALHAMBRA survey up to z ∼ 1 III. The stellar content of the quiescent galaxy population during the last 8 Gyr
    (2019) Diaz-Garcia, L.A.; Cenarro, A.J.; Lopez-Sanjuan, C.; Ferreras, I.; Fernandez-Soto, A.; Delgado, R.M.G.; Marquez, I.; Masegosa, J.; San Roman, I.; Infante Lira, Leopoldo; Viironen, K.; Bonoli, S.; Cerviño, M.; Moles, M.; Cristóbal-Hornillos, D.; Alfaro, E.; Aparicio-Villegas, T.; Benítez, N.; Broadhurst, T.; Cabrera-Caño, J.; Castander, F.J.; Cepa, J.; Husillos, C.; Aguerri, J.A.L.; Martínez, V.J.; Molino, A.; del Olmo, A.; Perea, J.; Prada, F.; Quintana, J.M.
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    Stellar populations of galaxies in the ALHAMBRA survey up to z∼1 II. Stellar content of quiescent galaxies within the dust-corrected stellar mass–colour and the UVJ colour–colour diagrams
    (2019) Diaz-Garcia, L.A.; Cenarro, A.J.; Lopez-Sanjuan, C.; Ferreras, I.; Cervino, M.; Fernandez-Soto, A.; Delgado, R.M.G.; Marquez, I.; Povic, M.|Infante Lira, Leopoldo; San Roman, I.; Viironen, K.; Moles, M.; Cristobal-Hornillos, D.; Lopez-Comazzi, A.; Alfaro, E.; Aparicio-Villegas, T.; Benitez, N.; Broadhurst, T.; Cabrera-Cano, J.; Castander, F.J.; Cepa, J.; Husillos, César; Aguerri, J.A.L.; Martínez, V.J.; Masegosa, Josefa; Molino, A.; Olmo, Ascensión del; Perea, Jaime; Prada, Francisco; Quintana, José María
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    The ALHAMBRA survey : 2D analysis of the stellar populations in massive early-type galaxies at z < 0.3
    (2018) San Roman, I.; Cenarro, A. J.; Díaz-García, L.A.; López-San juan, C.; Varela, J.; González Delgado, R.M.; Sánchez-Blázquez, P.; Alfaro, E.J.; Ascaso, B.; Infante Lira, Leopoldo
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    The Gaia-ESO Survey Mg-Al anti-correlation in iDR4 globular clusters
    (EDP SCIENCES S A, 2017) Pancino, E.; Romano, D.; Tang, B.; Tautvaisiene, G.; Casey, A. R.; Gruyters, P.; Geisler, D.; San Roman, I.; Randich, S.; Alfaro, E. J.; Bragaglia, A.; Flaccomio, E.; Korn, A. J.; Recio Blanco, A.; Smiljanic, R.; Carraro, G.; Bayo, A.; Costado, M. T.; Damiani, F.; Jofre, P.; Lardo, C.; de laverny, P.; Monaco, L.; Morbidelli, L.; Sbordone, L.; Sousa, S. G.; Villanova, S.
    We use Gaia-ESO (GES) Survey iDR4 data to explore the Mg-Alanti-correlation in globular clusters that were observed as calibrators, as a demonstration of the quality of Gaia-ESO Survey data and analysis. The results compare well with the available literature, within 0.1 dex or less, after a small (compared to the internal spreads) off set between the UVES and GIRAFFE data of 0.10-0.15 dex was taken into account. In particular, for the first time we present data for NGC 5927, which is one of the most metal-rich globular clusters studied in the literature so far with [Fe/H] = -0.39 +/- 0.04 dex; this cluster was included to connect with the open cluster regime in the Gaia-ESO Survey internal calibration. The extent and shape of the Mg-Al anti-correlation provide strong constraints on the multiple population phenomenon in globular clusters. In particular, we studied the dependency of the Mg-Al anti-correlation extension with metallicity, present-day mass, and age of the clusters, using GES data in combination with a large set of homogenized literature measurements. We find a dependency with both metallicity and mass, which is evident when fitting for the two parameters simultaneously, but we do not find significant dependency with age. We confirm that the Mg-Al anti-correlation is not seen in all clusters, but disappears for the less massive or most metal-rich clusters. We also use our data set to see whether a normal anti-correlation would explain the low [Mg/ff] observed in some extragalactic globular clusters, but find that none of the clusters in our sample can reproduce it; a more extreme chemical composition, such as that of NGC 2419, would be required. We conclude that GES iDR4 data already meet the requirements set by the main survey goals and can be used to study globular clusters in detail, even if the analysis procedures were not specifically designed for them.
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    The Gaia-ESO Survey: Detailed abundances in the metal-poor globular cluster NGC 4372
    (EDP SCIENCES S A, 2015) San Roman, I.; Munoz, C.; Geisler, D.; Villanova, S.; Kacharov, N.; Koch, A.; Carraro, G.; Tautvaisiene, G.; Vallenari, A.; Alfaro, E. J.; Bensby, T.; Flaccomio, E.; Francois, P.; Korn, A. J.; Pancino, E.; Recio Blanco, A.; Smiljanic, R.; Bergemann, M.; Costado, M. T.; Damiani, F.; Heiter, U.; Hourihane, A.; Jofre, P.; Lardo, C.; de Laverny, P.; Masseron, T.; Morbidelli, L.; Sbordone, L.; Sousa, S. G.; Worley, C. C.; Zaggia, S.
    We present the abundance analysis for a sample of 7 red giant branch stars in the metal-poor globular cluster NGC 4372 based on UVES spectra acquired as part of the Gaia-ESO Survey. This is the first extensive study of this cluster from high-resolution spectroscopy. We derive abundances of O, Na, Mg, Al, Si, Ca, Sc, Ti, Fe, Cr, Ni, Y, Ba, and La. We find a metallicity of [Fe/H] = -2.19 +/- 0.03 and find no evidence of any metallicity spread. This metallicity makes NGC 4372 one of the most metal-poor Galactic globular clusters. We also find an a-enhancement typical of halo globular clusters at this metallicity. Significant spreads are observed in the abundances of light elements. In particular, we find a Na-O anticorrelation. Abundances of O are relatively high compared with other globular clusters. This could indicate that NGC 4372 was formed in an environment with high O for its metallicity. A Mg-Al spread is also present that spans a range of more than 0.5 dex in Al abundances. Na is correlated with Al and Mg abundances at a lower significance level. This pattern suggests that the Mg-Al burning cycle is active. This behavior can also be seen in giant stars of other massive, metal-poor clusters. A relation between light and heavy s-process elements has been identified.