Teses de Doutorado PPGA

 

Submissões recentes

  • PEREIRA, ALAN WAGNER (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-03-15)
    This thesis investigated the variability of a set of B-type stars, using light curves from space telescopes Kepler and TESS. The analysis of 122 stars from the Kepler/K2 campaign 11 revealed a wide diversity of variability ...
  • TACURI, VERONICA LOAIZA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-02-02)
    In this thesis we present a spectroscopic study of 201 stars of F-, G-, and K-type stars that host exoplanets discovered by the Kepler and Kepler 2 (K2) mission. We analyzed two samples, one containing 81 stars from K2 and ...
  • DE JESUS SANTOS, WILTON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-03-28)
    Open clusters, rich in gas and dust, are excellent environment for star formation. The formation of massive stars, however, requires specific conditions, associated with the giant molecular clouds. Massive stars of spectral ...
  • LEAL DIAS, BRUNO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-02-20)
    We investigate the transition scale to homogeneity, RH , using as cosmic tracer the spectroscopic sample of blue galaxies from the Sloan Digital Sky Survey (SDSS). Considering the spatial distribution of the galaxy sample, ...
  • QUISPE HUAYNASI, FREDI (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-04-14)
    Stars with high velocities in the Galaxy are linked to extreme astrophysical events. The number of stars and the chemical and kinematic information of this population is essential to infer their places of origin, the ...
  • FRANCO DE OLIVEIRA, PATRICK (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-04-17)
    The origin of Mercury still remains poorly understood compared to the other rocky planets of the Solar System. One of the most relevant constraints that any formation model has to fulfill refers to its internal structure, ...
  • ROMMEL, FLAVIA LUANE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-12-19)
    Forty-five years had elapsed since the discovery of Chiron, three decades since the first observation of a trans-Neptunian object (except Pluto), and currently, thousands of small objects have been discovered in the outer ...
  • BATALHA DE MELO, REBECA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-10-14)
    This PhD thesis investigates the transport of metals from member galaxies of clusters and groups of galaxies to the intragroup/cluster medium and the efficiency of the mechanisms involved in the enrichment of metals in ...
  • EVANGELISTA SANTANA, MARCAL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-11-30)
    Abstract This work presents a study of the characterization of some hyperbolic comets. These objects represent approximately $12\%$ of the total population of comets and are potentially important since within the population ...
  • GALARZA AREVALO, CARLOS ANDRES (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-07-18)
    The data produced by large astronomical surveys (photometric and spectroscopic) represent a great challenge and a new way of doing research, based on sophisticated and precise machine learning techniques that, for example, ...
  • DA SILVA AVILA, FELIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-07-14)
    The cosmic growth rate, $f(z)$, presents great potential to discriminate alternative models to $\Lambda$CDM, considered the standard model of cosmology. With its simple parametrization, $f(z)=\Omega_{\text{m}}^\gamma$, the ...
  • DA SILVA ARCOVERDE, PLICIDA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-06-29)
    The observation of near-Earth objects (NEOs) allows us to study the physical characteristics of the smallest bodies in our Solar System, as well as to impose restrictions on their origin and evolution. Among the various ...
  • BATISTA SOUZA, TIAGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-12-08)
    Classical Be stars are defined as those stars whose spectrum has, or had for some time, one or more Balmer lines in emission. These stars show a transient gaseous circumstellar disk, whose formation process is still not ...
  • ARAGAO HASSELMANN, PEDRO HENRIQUE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-08-25)
    The two main Small Body populations, asteroids and comets, present different physical-chemical caracteristics on their surfaces. Most of the studies of their surfaces is based on the observation of integrated light from ...
  • COUTINHO DE CARVALHO, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-09-11)
    The distribution of galaxies, provided by large astronomical surveys, makes possible detailed studies of the nature of the primordial density fluctuations and the process of structure formation in the universe. Among the ...
  • BENEDETTI ROSSI, GUSTAVO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-01)
    After almost 25 years of the discovery of the first trans-Neptunian object (TNO), besides Pluto, more than 1930 other objects were discovered at the outer solar system. The study of those bodies can provide precious ...
  • DE ALMEIDA BRAGANCA, GUSTAVO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-14)
    In this work, we analysed high resolution spectra of a large sample of OB stars located in the Galactic disk aimed to study the distribution of the projected stellar rotation (vseni) and the radial distribution of chemical ...
  • GONZALES DAVALOS, JORGE ALEJANDRO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-05-24)
    In this work were generated synthetic spectra with shape effect, determining its spectral parameters: the center of the absorption bands, the ratio of the bands and the spectral slope. It has been shown that only the slope ...
  • PAES BENGALY JUNIOR, CARLOS ANDRE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-12-16)
    In this work, we probe the validity of the cosmological isotropy hypothesis, which constitutes one of the main pillars of the Cosmological Principle, in the light of current observational data. We search for possible ...
  • DE JESUS RONDON BRICENO, EDUARDO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-12-21)
    Seventeen asteroids of the main belt and three near earth asteroids have shown cometary activity. These objects have been called Active Asteroids (AA) (Jewitt, 2012). The physical source of their activity can be diverse; ...

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