Banca de QUALIFICAÇÃO: VANDERSON BALIEIRO

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
DISCENTE : VANDERSON BALIEIRO
DATA : 28/08/2019
HORA: 14:00
LOCAL: na sala 301, 3º andar, Bloco B, Campus SA da Fundação Universidade Federal do ABC, localizada na Avenida dos Estados, 5001, Santa Terezinha, Santo André, SP
TÍTULO:

Azimuthally symmetrical spherical accretion in the presence of a time dependent magnetic field

PÁGINAS: 30
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Física
SUBÁREA: Física dos Fluídos, Física de Plasmas e Descargas Elétricas
ESPECIALIDADE: Física de Plasmas e Descargas Elétricas
RESUMO:

The increasing advancement of astrophysics and the study of black holes shows us that we still have a long way to go in the study of particle accretion in compact objects. Its relevance is due to the fact that it is the main source of energy for these objects and is of great importance to the studies performed on these systems, due to the detection of x- and gamma- rays and emitted during the accretion phenomenon. Although not the most studied type of phenomenon, due to its low intensity of radiation emission, which hinders its detection by the existing apparatus, the spherical accretion has relevance in the study of the types of accretion because it encompasses most of the systems. non-binaries, whose rotational speed is considerably slow compared to what we see in binaries and black holes. From the work developed on spherical accretion, Bondi's work stands out, pioneering the deduction of a particle accretion rate by its accretor, obtaining a relationship between the accretion rate and the particle velocity from the simplification of the compact object in study (absence of magnetic field, rotation, heat exchange and pressure). In this paper, we present a review of Bondi's spherical accretion theory, adding analyzes of particle velocity behavior as it approaches the surface of the acretor, showing its transition from subsonic to supersonic as we approach a critical radius, or sonic ray, of the acretor. We then propose to include a magnetic dipole to the compact object and we study its implications from the graphical analysis of the path level curves along the polar plane. Finally, we address further developments to be pursued along the next months.

 

Por m, discorre

MEMBROS DA BANCA:
Presidente - Interno ao Programa - 1549709 - GERMAN LUGONES
Membro Titular - Examinador(a) Interno ao Programa - 1545176 - MARCELO AUGUSTO LEIGUI DE OLIVEIRA
Membro Titular - Examinador(a) Interno ao Programa - 1838185 - FERNANDO LUIS DA SILVA SEMIAO
Membro Suplente - Examinador(a) Externo ao Programa - 1544412 - GUSTAVO MICHEL MENDOZA LA TORRE