Výsledky vyhledávání - "Evolucao estelar"

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424

Autor: Uzundag, Murat, Córsico, Alejandro Hugo, Kepler, Souza Oliveira, Althaus, Leandro Gabriel, Werner, Klaus, Reindl, Nicole, Vuckovic, Maja

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

We present two new GW Vir-type pulsating white dwarf stars, TIC 0403800675 (WD J115727.68-280349.64) and TIC 1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric data. For both stars, the TES

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::81ccd2770e02a6f2e6a5984bde138e4f

Zobrazit plný text záznamu

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

Zobrazit plný text záznamu

The Li–age correlation: the Sun is unusually Li deficient for its age

Autor: Carlos, M, Meléndez, J, Spina, L, A dos , L, Santos, Bedell, M, Ramirez, I, Asplund, M, L Bean, J, Yong, D, Yanaundefined, J, Galarza, Alves-Brito, A

Publikováno v: Monthly Notices of the Royal Astronomical Society
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

The present work aims to examine in detail the depletion of lithium in solar twins to better constrain stellar evolution models and investigate its possible connection with exoplanets. We employ spectral synthesis in the region of the asymmetric 6707

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3849a8fa80778eb3cd7977f50f49a8b6
https://doi.org/10.1093/mnras/stz681

Zobrazit plný text záznamu

A deep view of a fossil relic in the Galactic bulge: the Globular Cluster HP 1

Autor: Sergio Ortolani, Domenico Nardiello, Mattia Libralato, Eduardo Luiz Damiani Bica, Leandro Kerber, Angeles Pérez-Villegas, Bruno Dias, Stefano O. Souza, Beatriz Barbuy, R. A. P. Oliveira

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

HP$\,$1 is an $\alpha$-enhanced and moderately metal-poor bulge globular cluster with a blue horizontal branch. These combined characteristics make it a probable relic of the early star formation in the innermost Galactic regions. Here we present a d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::709c5771cf0d5f1254b27d3c72235db1
https://doi.org/10.1093/mnras/stz003

Zobrazit plný text záznamu

Asteroseismology of massive ZZ Ceti stars : an updated grid of fully evolutionary models

Autor: Klippel, Theylor Schumacher

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

As estrelas anãs brancas são o resultado mais comum da evolução estelar, sendo o produto final de mais de 95% das estrelas da nossa Galáxia. Durante a sua evolução, as estrelas anãs brancas atravessam diversas zonas conhecidas como faixas de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::02e72a9edc227dfaec157dc175b294a7

Zobrazit plný text záznamu

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS. II. Discovery of two new GW Vir stars: TIC 333432673 and TIC 095332541

Autor: Maja Vučković, G. O. da Rosa, M. Uzundag, Keaton J. Bell, A. H. Córsico, Souza Oliveira Kepler, N. Reindl, Alina G. Istrate, Michael Higgins, Leandro Gabriel Althaus, Klaus Werner

Publikováno v: Astronomy & Astrophysics, 655, 1-12
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Astronomy & Astrophysics, 655, pp. 1-12

Context. The Transiting Exoplanet Survey Satellite (TESS) mission is revolutionizing the blossoming area of asteroseismology, particularly of pulsating white dwarfs and pre-white dwarfs, thus continuing the impulse of its predecessor, the Kepler miss

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d280c027d92cda65f9b6e66ce7e71c40
http://hdl.handle.net/2066/239752

Zobrazit plný text záznamu

Powerful winds in high-redshift obscured and red quasars

Autor: Serena Perrotta, Greg Walth, Rogemar A. Riffel, Nadia L. Zakamska, Thaisa Storchi Bergmann, D. Wylezalek, Maren Cosens, David S. N. Rupke, Rachael Alexandroff, Andrey Vayner, Shelley A. Wright, Sylvain Veilleux, Fred Hamann

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

Quasar-driven outflows must have made their most significant impact on galaxy formation during the epoch when massive galaxies were forming most rapidly. To study the impact of quasar feedback we conducted rest-frame optical integral field spectrogra

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bfec3701820cae7a1d5909f648322ca2

Zobrazit plný text záznamu

Convection and rotation boosted prescription of magnetic braking application to the formation of extremely low-mass white dwarfs

Autor: Soethe, Leonardo Taynô Tosetto, Kepler, Souza Oliveira

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

Extremely low-mass white dwarfs (ELM WDs) are the result of binary evolution in which a low-mass donor star is stripped by its companion leaving behind a helium-core white dwarf (WD). We explore the formation of ELM WDs in binary systems considering

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::47bfcbe231b0af445fe9db017a443827

Zobrazit plný text záznamu

The Hubble space telescope UV legacy survey of galactic globular clusters : XX. Ages of single and multiple stellar populations in seven bulge globular clusters

Autor: Oliveira, Raphael Augusto Pereira de, Bica, Eduardo Luiz Damiani, Vesperini, Enrico

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

In the present work we analyzed seven globular clusters (GCs) selected from their location in the Galactic bulge and with metallicity values in the range −1.30 lesssim [Fe/H] lesssim −0.50. The aim of this work is first to derive cluster ages ass

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::96a3e831b55140eda340c8635484954b

Zobrazit plný text záznamu

White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14

Autor: Kepler, Souza Oliveira, Pelisoli, Ingrid Domingos, Koester, Detlev, Reindl, Nicole, Geier, Stephan, Romero, Alejandra Daniela, Ourique, Gustavo, Oliveira, Cristiane de Paula, Amaral, Larissa Antunes

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

White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of each population. Examining the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::0cb44c787fb8c94f77c290601a79dfed

Zobrazit plný text záznamu

Vyhledávací nástroje:

Upřesnit hledání