Dissertações de Mestrado PPGA

 

Recent Submissions

  • VALIM CALCADA, GABRIEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-06-05)
    Galaxy clusters are the foundations of large-scale structure, whose abundance and respective masses provide information about the organization of the universe, as well as special environments for galaxy evolution. In this ...
  • PINTO RODRIGUES DE ALMEIDA, KARYNE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-01-31)
    Some of the brightest stars undergo sporadic and intense mass loss events, whose origins have not yet been fully understood. These hot and evolved stars are referred to as Luminous Blue Variables (LBVs), and their instability ...
  • GOMES DEGEN, RODOLPHO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-05-31)
    The study of asteroids and, in particular, Near Earth Asteroids (NEA, the acronym in English Near Earth Asteroids) is fundamental for understanding the formation and evolution of the Solar System. The surface characterization ...
  • SILVA SOARES, MARCOS FELIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-06-01)
    The existence of multiple components of the main sequence has been verified in globular clusters and, surprisingly, in open clusters with ages between ~ 15 M yr and ~ 600 M yr (LI et al., 2019). This observational results ...
  • EMANUEL CORDEIRO DA SILVA, MARCOS VINICIUS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-06-23)
    Despite being first described in the late 1970s, hot subdwarf stars are still not fully understood, especially when it comes to the necessary conditions and mechanisms responsible for their formation. One of the biggest ...
  • SONALLY DA SILVA SOUZA, AYSLANA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-07-07)
    Barium stars are G and K type stars that exhibit an overabundance of elements synthesized through the slow neutron capture process (s-process) in their atmospheres, along with characteristic spectral signatures of C2, CH, ...
  • NASCIMENTO FRANCO, CAMILA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-08-07)
    We investigate the statistical isotropy of the Local Universe by employing model- independent analyses using the Arecibo Legacy FAST Alfa Survey (ALFALFA) data, which covers a redshift range of 0 < z < 0.06. The flat-ΛCDM ...
  • DA SILVA JUNIOR, ROMUALDO ELEUTERIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-08-09)
    AE Aqr is an enigmatic Intermediate Polar, Cataclysmic Variable system. Although X-ray pulsations support the presence of an accretion column, as is typical in systems of such a class, some pieces of evidence suggest that ...
  • FARAJ DE SOUZA, RAYFF ABY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-08-10)
    In this work, we explore aspects of a Non-Minimal Higgs Inflation model, where radiative corrections are included in the Coleman-Weinberg approximation. By means of a MCMC analysis, we constrain the parameter that quantifies ...
  • MARREIRA FARIAS, JOSE VICTOR (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-09-13)
    HII galaxies (HIIG) are a subgroup of extremely bright, starburst compact dwarf irregular galaxies that carry an empirical correlation between velocity scattering (σ), observed from the width of the emission lines and ...
  • 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 ...
  • da Silva Guerini, Thais (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-04-07)
    In 1970 the cosmologist Allan Sandage described Cosmology as ” the search for two numbers”, referring to the Hubble parameter H0 and the deceleration parameter q0 [1]. Cosmography is a useful tool to test models and estimate ...
  • ALVES RAMOS, ANDRE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-12-02)
    Open clusters are star systems gravitationally bound and distributed throughout the galactic disk. Since their distances and ages are well determined, they become important astrophysical laboratories and can be used as ...
  • PEREIRA DA SILVA, JOSE WESLLEY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-09-27)
    The NEOs (Near-Earth Objects) are small bodies of the Solar System in orbits close to the Earth's orbit, these objects are divided into 4 subgroups: Atiras, Aten, Apollo, and Amor. Studying the physical properties of these ...
  • DE CARVALHO, LETHYCIA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-08-30)
    After centuries of acceptance of geocentrism, the heliocentric model and cosmic pluralism strengthened the idea of multiple worlds. Currently, thousands of these objects have already been confirmed and a considerable ...
  • COSTA DE ALMEIDA, ELLEN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-08-22)
    Since the discovery of the first exoplanet around a solar-type star in 1995, we have witnessed a fast increase in the number of detected exoplanets – surpassing the mark of 5000. These discoveries, associated with an ...
  • DA SILVA RODRIGUES, GABRIEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-08-05)
    Testing the variability of fundamental constants in Nature consists in one of the strongest tests of fundamental Physics. Any significant evolution of these values would immediately hint at new physics, and demand a profound ...
  • FRANCISCO WESLEY , DE OLIVEIRA MESQUITA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-02-25)
    In the present work we performed a study aiming to better understand the origin of Near-Earth Objects (NEOs) using their surface composition distribution, or taxonomic classification, in comparison with those of diverse ...
  • MARTINEZ RIBEIRO, EVANDRO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-03-20)
    The �� Cassiopeiae-like stars comprise a class of Be stars with variable hard thermal X- ray emission. For a long time, �� Cas was the odd man out among X-ray emitters. More recently, observations of stars with similar ...
  • DE SOUZA, SANDRO RICARDO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-03-30)
    Hypervelocity stars, or HVS, are stars having galactocentric velocities greater than the escape velocity of the Galaxy. The study of HVSs began when Hills (1988), using numerical simulations, predicted the disruption of a ...

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