Teses de Doutorado PPGA: Recent submissions

  • MARTINS SOUTO, DIOGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-03-02)
    In this Thesis, we present the first results of a detailed chemical study of M-dwarf stars. We demonstrate that it is possible to obtain elemental abundances of up to thirteen elements (C, O, Na, Mg, Al, Si, K, Ca, Ti, V, ...
  • JEARIM PENA SUAREZ, VLADIMIR (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-08-10)
    ABSTRACT Using a sample of eight high resolution spectra of the red giants in the open cluster NGC 4349, we determined its atmospheric parameters and the chemical abundances of the light elements LiCNO, the refractory ...
  • BOUFLEUR, RODRIGO CARLOS (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-08-28)
    One of the most promising topics in modern astronomy is the discovery and characterization of extrasolar planets. Space missions dedicated to search exoplanets produced a formidable amount of data. In particular the Kepler ...
  • NASCIMENTO DE PRA, MARIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2017-08-30)
    Primitive asteroids are considered transitional objects between rocky and icy bodies. They are expected to present volatile-rich content, such as hydrated minerals. The hydration level can be obtained by the study of the ...
  • GONZALEZ SANCHEZ, JAVIER ERNESTO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-02-26)
    The current large astronomical surveys have allowed us access to a growing quantity and quality of observational data. For this reason, it is necessary to explore different techniques to model and extract the maximum ...
  • DIAS DA SILVEIRA, MARLON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-06-15)
    In this work we analyzed, using high-resolution spectroscopy, a sample of 12 single and 4 spectroscopic binary red giant stars of the open cluster NGC 2447 and another sample made up of 4 red giants stars from the open ...
  • HUANCA CONDORI, CESAR AUGUSTO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-09-18)
    Abstract The stars with the B[e] phenomenon are characterized by the presence in the optical spectrum of B-type stars of: intense Balmer emission lines; permitted emission lines of singly ionized metals, e.g., Fe II; and ...
  • NEVES CAMPAGNOLO, JULIO CESAR (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-12-21)
    Abstract: This PhD thesis is related to Luminous Blue Variable stars (LBV), which are some of the most luminous stars and are characterized by eruptive processes that cause intense photometric and spectroscopic variability. ...
  • SANTOS DA COSTA, SIMONY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-03-29)
    Abstract: Understanding the origin of the current cosmic acceleration is one of the biggest challenges in cosmology nowadays. In the context of the standard cosmological model, this acceleration is assigned to a dark energy ...
  • 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 ...
  • LOAIZA AGUDELO, MARYORY (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-06-21)
    Physical properties of starburts galaxies at low redshift: ``Lyman Break Analogs'' Lyman Break Analogs (LBAs) are starburst systems at low redshift undergoing intense and continuous processes of star formation, usually as ...
  • SAAD OLIVERA, XIMENA BEATRIZ (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-06-27)
    bstract In this thesis, we present results about the complete characterization of dynamical parameters in three planetary systems, Kepler-46, Kepler-419 and Kepler-59, through the analysis of the transit timing variations ...
  • MARTINEZ, CINTIA FERNANDA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-06-28)
    The great statistic provided by the \textit {Kepler} mission, with the confirmation of over 4000 planets, shows the need to characterize the planets. A fundamental parameter to infer the nature of the planets is the planetary ...
  • ANTUNES MARQUES, GABRIELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-07-17)
    The photons propagating in the Universe have their trajectories disturbed due to the presence of massive structures along the line-of-sight, producing the so-called gravitational lensing effect. Because it is sensitive to ...
  • AYALA LOERA, MA DEL CARMEN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-07-25)
    This work reports the results of photometric studies of transNeptunian objetcs (TNOs). Absolute magnitudes and phase coefficient from TNOs were computed (H V and β V for 124 TNOs and H R and β R for 123 TNOs). We computed ...
  • MORGADO, BRUNO EDUARDO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-09-19)
    Progress in astrometry and in dynamical modeling of planetary systems have made possible the accurate estimation of tidal effects in natural moons and their planets. These studies have provided essential constraints on ...
  • FRAGA GUERCO, RAFAEL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-09-26)
    The astrophysical origin of fluorine is not yet well known, but it is suggested that this element might be produced in four sites: stars on the asymptotic giant branch, via neutron and proton captures during He-burning ...
  • LUCIO MEDEIROS, HISSA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-07-25)
    In order to contribute to a better understanding of the origin and evolution from different populations of small bodies, we did studies about some physical properties both obtained and from our observations. Initially, it ...
  • BAELLA PAJUELO, NOBAR OCTAVIO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2012-03-30)
    Entre as 180 estrelas simbióticas conhecidas existe um grupo especial classificado como simbióticas amarelas Tipo-S (SATS). Esses objetos apresentam uma alta velocidade radial e baixa metalicidade que correspondem a ...
  • DE CARVALHO FILHO, EDILSON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2019-12-11)
    Abstract The large scale structure of the Universe has been studied at several redshifts using different cosmic tracers. Among the methods employed, the search for the signature of the baryon acoustic oscillations (BAO) ...