Výsledky vyhledávání - "Abundância estelar"

Dissertation/ Thesis

Enriquecimento de elementos pesados no aglomerado globular do bojo NGC 6522: traços da primeira geração de estrelas

Autor: Cantelli, Elvis William Carvalho dos Santos

Há uma concentração de aglomerados globulares moderadamente pobres em metais no bojo galáctico, e muitos deles mostram um Ramo Horizontal Azul (BHB). Essas características juntas apontam para uma idade antiga. Para entender melhor a origem desse

Externí odkaz: http://www.teses.usp.br/teses/disponiveis/14/14131/tde-17102018-105902/

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Carbon, isotopic ratio 12C/13C, and nitrogen in solar twins: constraints for the chemical evolution of the local disc

Autor: Alan Alves-Brito, Lorenzo Spina, Jacob L. Bean, Jorge Melendez, R B Botelho, A. de C. Milone

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Abundances of light elements in dwarf stars of different ages are important constraints for stellar yields, Galactic chemical evolution and exoplanet chemical composition studies. We have measured C and N abundances and $^{12}$C/$^{13}$C ratios for a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a7ac7d73aca1c4b803f3796766dc070a
https://doi.org/10.1093/mnras/staa2917

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The impact of the uncertainties in the 12C(α, γ ) 16O reaction rate on the evolution of low- to intermediate-mass stars

Autor: Pepper, Ben Thomas, Istrate, Alina G., Romero, Alejandra Daniela, Kepler, Souza Oliveira

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

One of the largest uncertainties in stellar evolutionary computations is the accuracy of the considered reaction rates. The 12C(α, γ ) 16O reaction is particularly important for the study of low- and intermediate-mass stars as it determines the fin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::3dc628a199362f8b316cb6c70cd69c91

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Efeitos das taxas de reação 12C(α, γ) 16O em computações de evolução estelar simples

Autor: Pepper, Ben Thomas

Publikováno v: Biblioteca Digital de Teses e Dissertações da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Uma das maiores incertezas em computações evolutivas estelares é a precisão das taxas de reação consideradas. A reação 12C(α, γ) 16O é importante em estrelas de todas as massas, mas é de particular importância para o estudo de estrelas d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::510da3556e05007a87fd29f4cfa2ecf9

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SDSS-IV MaNGA: Exploring the local scaling relations for N/O

Autor: Adam L. Schaefer, Christy Tremonti, Guinevere Kauffmann, Brett H. Andrews, Matthew A. Bershady, Nicholas F. Boardman, Kevin Bundy, Niv Drory, José G. Fernández-Trincado, Holly P. Preece, Rogério Riffel, Rogemar A. Riffel, Sebastián F. Sánchez

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present, for the first time, the relationship between local stellar mass surface density, $\mathrm{\Sigma_{*}}$, and N/O derived from SDSS-IV MaNGA data, using a sample of $792765$ high signal-to-noise ratio star-forming spaxels. Using a combinati

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::608ce46fc5c3be709c453f98e3e29b08

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Chemical abundances in Seyfert galaxies : VII. Direct abundance determination of neon based on optical and infrared emission lines

Autor: Armah, Mark, Dors Júnior, Oli Luiz, Aydar, Catarina, Cardaci, Mónica V., Hägelle, Guillermo Federico, Feltre, Anna, Riffel, Rogério, Riffel, Rogemar André, Krabbe, Angela Cristina

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::0976959a95c401271e813fd772abb868

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Spectroscopic analysis of red giant stars in galactic open clusters

Autor: Cantanhêde, Saulo de Oliveira

Publikováno v: Biblioteca Digital de Teses e Dissertações da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Os aglomerados estelares são essenciais para estudar a idade, a distribuição espacial, a dinâmica, a cinemática e a composição química de diferentes populações estelares em diferentes componentes Galácticas. Assim, usamos estrelas gigantes

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::37bffb2e85d6d2e77c7ff2e280739b14

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The R-Process Alliance: A Very Metal-poor, Extremely r-process-enhanced Star with [Eu/Fe] = + 2.2, and the Class of r-III Stars

Autor: Moreno, Jorge Luis Meléndez

Publikováno v: Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual)
Universidade de São Paulo (USP)
instacron:USP

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::900b6bccdc9d686bbbc6115372cf8d4a
https://iopscience.iop.org/article/10.3847/1538-4357/aad37d

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The 16th data release of the sloan digital sky surveys : first release from the APOGEE-2 Southern Survey and full release of eBOSS spectra

Autor: Ahumada, Romina, Riffel, Rogério, Storchi-Bergmann, Thaisa, Zou, Hu

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Twenty years have passed since first light for the Sloan Digital Sky Survey (SDSS). Here, we release data taken by the fourth phase of SDSS (SDSS-IV) across its first three years of operation (2014 July–2017 July). This is the third data release fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::04bf0fc9a300c51b029bbcf014861073

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Abundances from integrated spectra of 47 Tucanae (NGC 104)

Autor: T. C. Moura, Marina Trevisan, Christiano Santos Rennó, Beatriz Barbuy

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

47 Tucanae is among the most studied and observed globular clusters, given its proximity. The aim of this work is to study in detail the integrated spectrum of 47 Tucanae, as a template, in order to have a list of reliable lines that are validated fo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3c253abcddacf3b3208e3e9457a50960

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