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  • LIMA RIBEIRO, PAULA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2019-08-27)
    A large pioneer marine magnetotelluric (MMT) campaign were made at the Santos Basin in Brazil in 2007 aiming to asses the outcome of the method in a wide range of water depths in region where pre-salt sediments are present. ...
  • FRAGA GUERCO, RAFAEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-03-18)
    The origin of the element fluorine is not well known, but it is known that this element can be produced in three sites: spallation induced by neutrinos after the core collapse phase of a massive supernova; synthesis during ...
  • 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 ...
  • LOAIZA TACURI, VERONICA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-09-06)
    Chemical Abundances in red giants of the open clusters NGC 2420, NGC 6819 and NGC 6705 from APOGEE spectra Studying chemical abundances of stars belonging to open clusters helps in understanding the formation and evolution ...
  • MARINELLO ASSIS DE OLIVEIRA, MURILO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-04-12)
    Active galactic nuclei (AGN) are the most luminous astronomical objects in the sky. Different from normal galaxies, AGN are characterized by a strong luminous nucleus which can not be associated with its stars. In this ...
  • DE OLIVEIRA COELHO, DIOGO LUIZ (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2015-04-29)
    The geological context of the study area includes the Southeast of Brazil Continental Rift, covered by polycyclic terrains from the south of the Ribeira Belt. Twenty-four broadband temporary seismographic stations were ...
  • 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 ...
  • DA SILVA BARBOSA, CLEITON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2013-02-28)
    A análise dos dados paleomagnéticos mostram que o campo magnético da Terra inverteu sua polaridade de maneira desordenada e repentina nos últimos 160 milhões de anos. Trabalhos recentes sobre análise de dados, modelagem ...
  • 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 ...
  • 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 ...
  • LIMA MELHORATO, RODRIGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2015-01-26)
    This work proposes a calibration methodology and measurements with Scintrex gravimeters, CG-5 model, in the form of technical-scientific procedures. It is also carried out a critical analysis of the sources of uncertainty ...
  • DA SILVA AVILA, FELIPE (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-02-27)
    The standard model of cosmology is based on the Cosmological Principle (CP), which states that, on large scales, the Universe is homogeneous and isotropic. It predicts that the transition from an inhomogenous to a homogeous ...
  • LARANJEIRA, SERGIO EDUARDO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-07-07)
    Recent observational data suggest that, from the total content of the universe, ∼ 26% is in the form of the so-called Dark Matter (DM). At present, there is no settled understanding of its nature. On the other hand, galactic ...
  • DA CUNHA MACEDO, HELBER (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Geofísica, 2013-12-11)
    The present work aims to develop a methodology that enables the prediction and harmonic analysis of ocean tides. Three computer codes were developed in Fortran. Two of them make the harmonic analysis to generate the fifteen ...
  • 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 ...
  • 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 ...
  • ANTUNES MARQUES, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-07-23)
    Observations of temperature and polarization of the cosmic microwave background (CMB) provide important information of the early universe. The CMB temperature fluctuations are related to the perturbations from inflationary ...
  • 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 ...
  • 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 ...
  • 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, ...