Stellar Astrophysics
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Radial oscillations of quark stars: effect of color superconductivity / Oscilações radiais de estrelas de quarks: efeito da superconditividade de cor
The study of radial oscillations of compact stars offers valuable information about their structural stability. These oscillations are also important because they can be observed in the microstructure of the emission prole of certain pulsars and because they can excite the non-radial modes which give rise to gravitational waves. In this work we investigate t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2009
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2. Study of nuclear reactions of astrophysics interest through the trojan horse method / Estudo de reações nucleares de interesse astrofísico utilizando o método do cavalo de tróia
Nuclear Astrophysics is the key to explain, among other things, the production of energy in stars, stellar evolution and the synthesis of chemical elements and isotopes in the Universe. In such cases, nuclear reactions are the main structure, where cross sections and reaction rates must be determined with reasonable accuracy in the laboratory. Because the ex
Publicado em: 2009
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3. Estudo de população de estrelas de nêutrons isoladas emissoras de raios X e silenciosas em rádio / Population study of radio-quiet and thermally emitting isolated neutron stars
O objetivo da tese é estudar as propriedades da população Galáctica de estrelas de nêutrons isoladas com emissão térmica em raios X mas silenciosas em rádio. Isto é feito iinvestigando-se a amostra existente de sete fontes próximas, conhecidas como Magnificent Seven (M7), assim como através da procura por novos candidatos e restringindo possíveis
Publicado em: 2009
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4. Ensino de física solar em um espaço não formal de educação / Teaching solar physics in an informal educational space
Observatories and planetariums offer the possibility of developing contextualized astronomy teaching by fostering educational activities that provide access to a more authentic school science. Thus, this research consisted in developing, applying and evaluating courses about the Sun for middle, junior high school students and solar physics for high school st
Publicado em: 2009
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5. A equação de Lane-Emden-Fowler em teoria classica de campos e astrofisica estelar / The Lane-Emden-Fowler equation in classical field theory and stellar astrophysics
Neste trabalho buscamos soluções exatas não-triviais da Equação de LaneEmden-Fowler. Esta equação tem aplicações importantes em Teoria de Campos não-linear, bem como em Astrofísica Estelar. Inicialmente, a partir do formalismo da Integral Primeira, obtemos soluções para um modelo >.~n+1 com n = 2,3,5, utilizando Integrais Elípticas de Jacobi. S
Publicado em: 2008
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6. Propriedades físicas de planetas extrasolares
ROTATION is one the most important aspects to be observed in stellar astrophysics. Here we investigate that particularly in stars with planets. This physical parameter supplies information about the distribution of angular momentum in the planetary system, as well as its role on the control of dierent phenomena, including coronal and cromospherical emission
Publicado em: 2008
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7. Studies in nuclear astrophysics using radioactive beams at the HRIBF
The availability of radioactive beams has produced great opportunities for advances in our understanding of the nucleosynthesis occurring in stellar explosions such as novae, X-ray bursts, and supernovae. At the HRIBF, we have used proton-rich beams such as 17;18F and neutron-rich beams such as 82Ge to study astrophysicallyimportant reaction rates. Large-are
Brazilian Journal of Physics. Publicado em: 2004-09
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8. Neutrino physics and astrophysics with the MACRO experiment at the Gran Sasso lab
The results of the MACRO experiment on atmospheric neutrino oscillations are presented and discussed. The data concern different event topologies with average neutrino energies of ~ 4 and ~50 GeV. The Multiple Coulomb Scattering of muons in the MACRO absorbers was used to estimate the neutrino energy of each event of the higher energy sample. The angular dis
Brazilian Journal of Physics. Publicado em: 2003-06
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9. Determinação de parâmetros atmosféricos de estrelas em NGC 6528 e NGC 6553 - aglomerados globulares de referência para o estudo de populações ricas em metais / Derivation of atmospheric parameters of stars in NGC 6528 and NGC 6553 - globular clusters of reference for the study of metal-rich populations
The metal-rich bulge globular clusters are a keystone for the understanding of the evolutionary history of our Galaxy and the study of the bulge stellar populations provides constraints to models of bulge formation. In this work we present the study of 22 stars in the globular clusters NGC 6528 and NGC 6553, templates of the metal-rich populations of the bul
Publicado em: 2000
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10. Helioseismology: Probing the interior of a star
Helioseismology offers, for the first time, an opportunity to probe in detail the deep interior of a star (our Sun). The results will have a profound impact on our understanding not only of the solar interior, but also neutrino physics, stellar evolution theory, and stellar population studies in astrophysics.
The National Academy of Sciences.