Browsing by Author "Gomez, A."

Now showing 1 - 6 of 6
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    CHLSOC : The Chilean Soil Organic Carbon database, a multi-institutional collaborative effort
    (2020) Pfeiffer, M.; Padarian, J.; Osorio, R.; Bustamante, N.; Federico Olmedo, G.; Guevara, M.; Aburto, F.; Albornoz G., Francisco; Antilén Lizana, Mónica; Araya, E.; Arellano, Eduardo; Barret, M.; Barrera, J.; Boeckx, P.; Briceño, M.; Bunning, S.; Cabrol, L.; Casanova, M.; Cornejo, P.; Corradini, F.; Curaqueo, G.; Doetterl, S.; Duran, P.; Escudey, M.; Espinoza, A.; Francke, S.; Pablo Fuentes, J.; Fuentes, M.; Gajardo, G.; García, R.; Gallaud, A.; Galleguillos, M.; Gomez, A.; Hidalgo, M.; Ivelic Sáez, J.; Mashalaba, L.; Matus, F.; Meza, F.; De La Luz Mora, M.; Mora, J.; Muñoz, C.; Norambuena, P.; Olivera, C.; Ovalle Ortega, Carlos Enrique; Panichini, M.; Munoz, C.; Pérez Quezada, J. F.; Radic, Smiljan; Ramirez, J.; Riveras, N.; Ruiz, G.
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    Decreased Expression of CoREST1 and CoREST2 Together with LSD1 and HDAC1/2 during Neuronal Differentiation
    (2015) Sáez, Juan Carlos; Gomez, A.; Barrios, A.; Parada, G.; Galdames, L.; Gonzalez, M.; Andrés Coke, María Estela
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    NGC 6558
    (2007) Barbuy, B.; Zoccali, M.; Ortolani, S.; Minniti, D.; Hill, V.; Renzini, A.; Bica, E.; Gomez, A.
    We present, for the first time, a detailed abundance analysis of five giant stars in the moderately metal-poor bulge globular cluster NGC 6558. Spectra have been obtained at the VLT with the multifiber spectrograph FLAMES in GIRAFFE mode ( R similar to 22; 000). The resulting iron abundance is [Fe/H] = -0. 97 +/- 0.15, in good agreement with the metallicity inferred from the slope of the red giant branch, but unusually high for a cluster with such a blue horizontal branch, possibly indicating an old age. A color-magnitude diagram in Vand I, based on photometry obtained with the Wide-Field Imager at ESO, is also presented. An isochrone of 14 Gyr fits the evolutionary sequences, confirming an old age. NGC 6558 is another "second-parameter'' bulge cluster. The metallicity derived is near the end of the low-metallicity tail of the bulge field-star distribution; hence, it presumably formed at the very early stages of the bulge formation. Abundance ratios show enhancements of the alpha-elements oxygen, magnesium, and silicon, with [O/Fe] = +0.38, [Mg/Fe] = +0.24, [Si/Fe] = +0.23, and solar calcium and titanium. The r-element europium is also enhanced by [Eu/Fe] = +0.36. The odd-Z elements sodium and aluminum, as well as the s-elements barium and lanthanum, show solar ratios. A heliocentric radial velocity of v(r)(hel) = -197.3 +/- 4 km s(-1) is found for NGC 6558.
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    Our Country Needs a Strong Leader Right Now : Economic Inequality Enhances the Wish for a Strong Leader
    (2019) Sprong, S.; Jetten, J.; Wang, Z.; Peters, K.; Mols, F.; Verkuyten, M.; Bastian, B.; Ariyanto, A.; Autin, F.; González Gutiérrez, Roberto; Ayub, N.; Badea, C.; Besta, T.; Butera, F.; Costa-Lopes, R.; Cui, L.J.; Fantini, C.; Finchilescu, G.; Gaertner, L.|Gollwitzer, M.; Gomez, A.
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    Oxygen abundances in the Galactic bulge
    (2006) Zoccali, M.; Lecureur, A.; Barbuy, B.; Hill, V.; Renzini, A.; Minniti, D.; Momany, Y.; Gomez, A.; Ortolani, S.
    Aims. We spectroscopically characterize the Galactic Bulge to infer its star formation timescale, compared to the other Galactic components, through the chemical signature on its individual stars.
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    The metal content of bulge field stars from FLAMES-GIRAFFE spectra -: I.: Stellar parameters and iron abundances
    (2008) Zoccali, M.; Hill, V.; Lecureur, A.; Barbuy, B.; Renzini, A.; Minniti, D.; Gomez, A.; Ortolani, S.
    Aims. We determine the iron distribution function (IDF) for bulge field stars, in three different fields along the Galactic minor axis and at latitudes b = -4 degrees, b = -6 degrees, and b = -12 degrees. A fourth field including NGC 6553 is also included in the discussion.