Dissertações de Mestrado PPGA

 

Submissões recentes

  • Vinícius Sanches Moreira Lima, Vinícius Sanches Moreira Lima (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-10-08)
    Active galactic nuclei (AGNs) with jets are morphologically classified according to their evolutionary stage, with Gigahertz Peaked-Spectrum (GPS) and Compact SteepSpectrum (CSS) sources traditionally understood as ...
  • VINICIUS DOS SANTOS BESSA RIBEIRO, VINICIUS DOS SANTOS BESSA RIBEIRO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-09-02)
    The accurate determination of the dynamical state of galaxy clusters is critical for cluster cosmology, as near-equilibrium processes in the intracluster medium of dynami- cally relaxed systems enable the derivation of ...
  • Thiago Flaulhabe Xavier Gomes, Thiago Flaulhabe Xavier Gomes (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-03-12)
    In this work, our objective is to conduct a comprehensive study of a sample of eight red giants previously reported as members of the open cluster IC 2714. Using high-resolution spectra, we have performed a chemical ...
  • Tatiane Corrêa da Costa e Silva, Tatiane Corrêa da Costa e Silva (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-09-26)
    The instrumental and night-sky characterization of an astronomical observatory are essential for efficient observation planning, appropriate of new instrument selection, and the application of photometric corrections, ...
  • RAQUEL SILVA FREITAS, RAQUEL SILVA FREITAS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-09-09)
    Low-Ionization Nuclear Emission-line Regions (LINERs) show ambiguities regarding the gas excitation mechanisms, often sharing characteristics with classical active galactic nuclei (AGNs). In this work, we proposed and ...
  • MADALENA NAIR COSTA MAIA, MADALENA NAIR COSTA MAIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-08-05)
    M dwarf stars constitute the most numerous stellar class in the Milky Way. However, due to the complexity of their spectra, which are rich in molecular lines, they remain the least studied spectral type in the literature. ...
  • Josué da Silva Cavalcante, Josué da Silva Cavalcante (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-03-31)
    The accuracy in astrometric and photometric measurements of moving objects in dense stellar fields, especially for small bodies of the Solar System, is challenging due to the contamination of the target's flux by neighboring ...
  • Jonatã Arcas Silva, Jonatã Arcas Silva (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-04-03)
    The greatest advancement in modern optical Astrometry has been the Gaia catalog. It solved long-standing challenges in the construction of reference catalogs with precise positions, free from the accumulation of systematic ...
  • ÍCARO MEIDEM SILVA, ÍCARO MEIDEM SILVA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-03-11)
    Since the discovery of the first exoplanet in 1995 orbiting a Sun-like star, more than 5,867 exoplanets have been identified, according to the NASA Exoplanet Archive. Knowing that planetary parameters depend directly on ...
  • ESTER COSTA NASCIMENTO, ESTER COSTA NASCIMENTO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-06-30)
    M dwarf stars are the most numerous in the Galaxy and stand out for being particularly favorable to the detection of Earth-like planets. The analysis of the chemical abundances of these stars is essential to understand ...
  • Antonis Jeyson Leon Huamani, Antonis Jeyson Leon Huamani (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2025-08-27)
    Star clusters are fundamental tools for studying the formation and evolution of galaxies. In particular, those located in tidal structures of the Magellanic Clouds such as the Magellanic Bridge, a structure of gas and stars ...
  • PATRICK PRADO DOS SANTOS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-09-04)
    Thermodynamic maps of galaxy clusters created from X-ray observations are capable of revealing structures within these systems much more effectively than analyses in optical frequencies, for example. Understanding the ...
  • GOIS DA SILVA, FILIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-12-19)
    Supergroups are “groups of galaxy groups” and/or galaxy clusters with substructures that might collapse into a single cluster. Since galaxy clusters have singular characteristics, such as a well-defined red sequence and a ...
  • SILVA DE ARAUJO, AMANDA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-07-18)
    Cataclysmic Variables (CVs) are binary systems in which a white dwarf (WD) accretes matter from a companion star on or near the main sequence. Some of the uncertainties about these systems revolve around the following ...
  • LOPES DA SILVA DIAS, MARIANA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-15)
    This work aims to conduct a consistency test of the Cosmological Principle, one of the fundamental hypotheses of the Standard Cosmological Model. This principle postulates that the Universe is homogeneous and isotropic on ...
  • GOMES LOPES, MARIA EDUARDA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2024-08-16)
    The bulk flow motion in the Local Universe is a collective phenomenon arising from the peculiar motions of matter structures, which, instead of moving randomly, appear to exhibit an approximately dipolar velocity flow. For ...
  • 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 ...

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