Stellar Activity
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Estudo da atividade estelar da Kepler-289 a partir da modelagem de trânsitos planetários
Resumo Neste trabalho apresentamos um estudo sobre atividade estelar e trânsitos planetários de exoplanetas. Sem apresentar rigor matemático demostramos como obter parâmetros físicos como: temperatura, intensidade e posição de manchas em superfície de estrelas do tipo solar, bem como, a rotação estelar média a partir de dados públicos da Missão
Rev. Bras. Ensino Fís.. Publicado em: 01/07/2019
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2. Atividade cromosférica induzida por planetas extrasolares gigantes
In the present work, we have analyzed the behavior of the chromospheric activity of stars with planets, as a function of different planetary parameters, searching for possible effects of planets on the chromosphere of the hosting star. For this study we have selected a sample of 73 main sequence stars with planets, of spectral types F, G and K. Our analysis
Publicado em: 2010
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3. Editorial
Publicado em: 2009
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4. Atividade nas Estrelas Secundárias de Variáveis Cataclísmicas
- Activity in the secondary star is an important ingredient for the removal of orbital angular momentum in cataclysmic variables. The magnetic-breaking of the secondary due to a stellar wind interacting with the interstellar medium, together with the emission of gravitational waves, define the evolutive fate of such binaries. However, the direct observation
Publicado em: 2009
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5. Sobre a natureza dos processos físicos de aquecimento da atmosfera de estrelas do tipo solar
In the present work, we have studied the nature of the physical processes of the coronal heating, considering as basis significant samples of single and binary evolved stars, that have been achieved with the ROSAT satellite. In a total of 191 simple stars were studied, classified in the literature as giants with spectral type F, G and K. The resu
Publicado em: 2008
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6. Processos de aquecimento na alta atmosfera estelar: emissão coronal em raio-x e emissão cromosférica em CaII
In the present work we study the processes of heating in the high stellar atmosphere, with base in an analysis of behavior of the cromospheric and coronal emission for a sample of single stars classified as giant in the literature. The evolutionary status of the stars of the sample was determined from HIPPARCOS satellite trigonometric parallax measurements a
Publicado em: 2006
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7. Sobre a relação entre rotação, atividade crosmosférica e abundância de lítio em estrelas subgigantes
The connection between rotation, CaII emission flux and lithium abundance is analyzed for a sample of subgiant stars, with evolutionary status was determined from the Toulouse-Geneve code and HlPPARCOS trigonometric parallax measurements. We noted that the distribution of rotation and CaII emission flux, as a function of effective temperature, shows a discon
Publicado em: 2003
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8. Optical evidence for the unification of active galactic nuclei and quasi-stellar objects.
There is a variety of optical evidence for some unification of different types of active galactic nuclei and quasi-stellar objects (QSOs). The case is very strong for the unification of at least some Seyfert galaxies, where polarization data show that the type assigned to the Seyfert galaxy must depend on viewing direction. It has been proposed that Fanaroff
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9. Jet-propelled escape in the squid Loligo opalescens: concerted control by giant and non-giant motor axon pathways.
Recordings of stellar nerve activity were made during escape responses in living squid. Short-latency activation of the giant axons is triggered by light-flash stimulation that elicits a stereotyped startle-escape response and powerful jet. Many other types of stimuli produce a highly variable, delayed-escape response with strong jetting primarily controlled