Zobrazeno 1 - 10 of 165 pro vyhledávání: '"Evolu??o estelar"'
2
Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : III. Asteroseismology of the DBV star GD 358
Autor: Córsico, Alejandro Hugo, Uzundag, Murat, Kepler, Souza Oliveira, Silvotti, Roberto, Althaus, Leandro Gabriel, Koester, Detlev, Baran, Andrzej, Bell, Keaton, Bischoff-Kim, Agnès, Hermes, James J., Kawaler, Steven D., Provencal, Judith L., Winget, Donald Earl, Montgomery, Michael Houston, Bradley, Paul A., Kleinman, Scot James, Nitta, Atsuko
Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Context. The collection of high-quality photometric data by space telescopes, such as the completed Kepler mission and the ongoing TESS program, is revolutionizing the area of white-dwarf asteroseismology. Among the different kinds of pulsating white
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=od______3056::d524ace0c836a9ccf66996a5472919c7
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3
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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4
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
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5
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
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6
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
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7
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
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8
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
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9
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
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10
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
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