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Nomenclatura Unesco > (21) Astronomía y Astrofísica

Mostrando recursos 81 - 100 de 587

81. A white dwarf merger as progenitor of the anomalous X-Ray pulsar 4U 0142+61? - Rueda, Jorge A.; Boshkayev, K.; Izzo, L.; Ruffini, R.; Loren Aguilar, Pablo; Kuelebi, B.; Aznar Siguan, Gabriela; García-Berro Montilla, Enrique
It has been recently proposed that massive, fast-rotating, highly magnetized white dwarfs could describe the observational properties of some of soft gamma-ray repeaters and anomalous X-ray pulsars (AXPs). Moreover, it has also been shown that high-field magnetic white dwarfs can be the outcome of white dwarf binary mergers. The products of these mergers consist of a hot central white dwarf surrounded by a rapidly rotating disk. Here we show that the merger of a double degenerate system can explain the characteristics of the peculiar AXP 4U 0142+61. This scenario accounts for the observed infrared excess. We also show that the...

82. Binary systems and their nuclear explosions - Isern Vilaboy, Jordi; Hernanz Carbó, Margarita; José Pont, Jordi

83. Introduction - José Pont, Jordi

84. Binary systems and their nuclear explosions - Isern Vilaboy, Jordi; Hernanz Carbó, Margarita; José Pont, Jordi

85. Introduction - José Pont, Jordi

86. Mean proton and alpha-particle reduced widths of the Porter-Thomas distribution and astrophysical applications - Pogrebnyak, I.; Howard, C.; Iliadis, Christian; Longland, Richard Leigh; Mitchell, G.E.
The Porter-Thomas distribution is a key prediction of the Gaussian orthogonal ensemble in random matrix theory. It is routinely used to provide a measure for the number of levels that are missing in a given resonance analysis. The Porter-Thomas distribution is also of crucial importance for estimates of thermonuclear reaction rates where the contributions of certain unobserved resonances to the total reaction rate need to be taken into account. In order to estimate such contributions by randomly sampling over the Porter-Thomas distribution, the mean value of the reduced width must be known. We present mean reduced width values for protons and α...

87. Mean proton and alpha-particle reduced widths of the Porter-Thomas distribution and astrophysical applications - Pogrebnyak, I.; Howard, C.; Iliadis, Christian; Longland, Richard Leigh; Mitchell, G.E.
The Porter-Thomas distribution is a key prediction of the Gaussian orthogonal ensemble in random matrix theory. It is routinely used to provide a measure for the number of levels that are missing in a given resonance analysis. The Porter-Thomas distribution is also of crucial importance for estimates of thermonuclear reactionrates where the contributions of certain unobserved resonances to the total reaction rate need to be taken into account. In order to estimate such contributions by randomly sampling over the Porter-Thomas distribution,the mean value of the reduced width must be known. We present mean reduced width values for protons and α...

88. Obtençao de perfil da temperatura na regiao de interseçao da tropopausa - estratopausa pelo projeto GPS/MET em medias latitudes - Monteiro, Sheron de Oliveira; Takahashi, Hisao; Gobbi, Delano

89. Rede internacional de detecção de muons aplicada na previsão do clima espacial - Andrioli, Vânia Fátima; Signori, Marcos R.; Savian, Jairo F.; Silva, Marlos R. da; Dal Lago, Alisson; Vieira, Luis Eduardo A.; Echer, Ezequiel; Gonzalez, Walter D.

90. Análise de parâmetros interplanetários responsáveis pela origem das tempestades geomágnéticas de 31 de mraço de 2001 e de 11 de abril de 2001 - Savian, Jairo Francisco; Silva, Marlos R. da; Signori, Marcos R.; Andrioli, Vânia F.; Lago, Alisson Dal; Vieira, Luis Eduardo A.; Echer, Ezequiel; Schuch, Nelson J.

91. Instalação do detector uni-direcional de partículas de raios cósmicos associadas a descargas elétricas atmosféricas no observatório espacial do sul OES/CRSPE/INPE-MCT - Signori, Marcos Roberto; Savian, Jairo Francisco; Silva, Marlos Rochenbach da; Andrioli, Vânia Fátima; Torii, Tatsuo; Makita, Kazuo

92. Espectro imageador para estudo das emissões óticas na região da anomalia magnética do Atlântico Sul (AMAS) - Santos, Daniel Michelon dos; Bageston, José Valentin; Monteiro, Sheron; Takahashi, Hisao; Gobbi, Delano

93. Masers de sio em objetos estelares jovens - Cassol, Nadiane Cristina

94. Utilizando a rede internacional de detectores multidirecionais de muons na previsão da tempestade geomagnética do dia 20 de novembro de 2003 - Andrioli, Vânia Fátima; Gonzalez, Walter Demétrio; Savian, Jairo Franscisco; Signori, Marcos Roberto; Silva, Marlos Rockenbach da; Dal Lago, Alisson; Vieira, Luis Eduardo; Echer, Ezequiel

95. Determinação de massa de estrelas anãs brancas - Lorandi, Melina

96. Danos provocados por tempestades geomagnéticas intensas, DST <-100 NT - Savian, Jairo Francisco; Schuch, Nelson Jorge

97. Análise de Galáxias Starburst na Região Espectral do Infravermelho Médio - Gertz, Jéssica Tamiris

98. Análise do diagrama cor-magnitude do aglomerado Whitting 1 - Queiroz, Anna Barbara de Andrade

99. Cinemática bi-­dimensional do gás no entorno de Núcleos Ativos de Galáxias - Leivas, Fernanda Rodrigues

100. Tópicos de fotometria: adaptação da cúpula do OCV e do fotómetro para micotoxinas - Guarise, Marcelo Serra

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