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Navegação Dissertações de Mestrado PPGA por título

Navegação Dissertações de Mestrado PPGA por título

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  • 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 ...
  • 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 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 ...
  • 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 ...
  • 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, ...
  • QUISPE HUAYNASI, FREDI (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-08-28)
    The study of transneptunian objects (TNOs) and Centaurs, because to their low brightness, is not simple. However, great contributions to the study and characterization of these objects have been obtained from the application ...
  • PINHO MAGALHAES, FABIOLA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2012-03-20)
    Most of our current knowledge of the Solar System relies on ground-based observations involving techniques like photometry and astrometry, but also Lunar Laser Ranging (LLR) and Very Large Baseline Interferometry (VLBI). ...
  • BASANTE ERAZO, CARLOS ARTURO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-28)
    Light curves from the occultation of a star by a distant body in the solar system allow us to meausre the dimensions of this latter with kilometric accuracies. This is rivaled only by measurements made by space probes. It ...
  • 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 ...
  • 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 ...
  • 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 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 ...
  • GARCIA, MATIAS JAVIER (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-11-25)
    The main objective of this work is the search of astrobiologically interesting planets through the physical characterization of rocky exoplanets within the habitable zone (HZ) of their host stars. To do this, we calculated ...
  • 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 ...
  • 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 ...