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  • BANDA HUARCA, MARTIN VALENTIN (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-09-25)
    One way to know the physical properties of Trans-Neptunian objects (TNOs) is the analysis of stellar occultations by these objects. The prediction of a stellar occultation basically depends on comparisons of TNOs' ephemeris ...
  • 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 ...
  • BATISTA SOUZA, TIAGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-12-08)
    Classical Be stars are defined as those stars whose spectrum has, or had for some time, one or more Balmer lines in emission. These stars show a transient gaseous circumstellar disk, whose formation process is still not ...
  • 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 ...
  • DA SILVA ARCOVERDE, PLICIDA MARIA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-02-23)
    In this work we present the results obtained from the study of the phase curve of 29 NEO through observations with the telescope of the Observatório Astronômico do Sertão de Itaparica (OASI), of the IMPACTON project. ...
  • 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 ...
  • 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 ...
  • DE JESUS SANTOS, WILTON (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2018-08-27)
    Abstract DISTRIBUTIONS OF PROJECTED ROTATIONAL VELOCITIES IN 4 OPEN CLUSTERS IN THE CARINA REGION Wilton de Jesús Santos August/2018 Advisor: PhD. Simone Daflon Program: Astronomy Trumpler 14, 15 and 16 (Tr14, Tr15 and ...
  • DE SOUZA FELICIANO, ANA CAROLINA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2016-03-30)
    The region beyond Neptune (transneptunian region) has more than 1900 objects composed of ices, which are considered the most pristine objects in the solar system. To analyze these objects from the ground, we utilize ...
  • 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 ...
  • 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 ...
  • EVANGELISTA SANTANA, MARCAL (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2022-11-30)
    Abstract This work presents a study of the characterization of some hyperbolic comets. These objects represent approximately $12\%$ of the total population of comets and are potentially important since within the population ...
  • FERNANDES DE MELO, RAPHAELA (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-11-30)
    Abstract Carbon stars constitute a vast and interesting class of chemically peculiar stars which has carbon overabundance relative to oxygen. This class of stars was first identified by Secchi (1868) and is characterized ...
  • 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 ...
  • 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 ...
  • FRANCO DE OLIVEIRA, PATRICK (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2023-04-17)
    The origin of Mercury still remains poorly understood compared to the other rocky planets of the Solar System. One of the most relevant constraints that any formation model has to fulfill refers to its internal structure, ...
  • HOLANDA LUCIANO JUNIOR, JOSE NACIZO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-01-28)
    FROM FIELD STARS TO OPEN CLUSTERS: CHEMICAL STUDIES BASED ON HIGH-RESOLUTION SPECTRA Abstract This work presents four comprehensive chemical studies about red giant stars belonging to the field and two open clusters. The ...
  • 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 ...
  • MAGALHAES DE ARAUJO, RODRIGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2021-04-06)
    Galaxies hosting active galactic nuclei (AGNs) play an important role in the evolution of galaxies. These AGNs are powered by the accretion of matter onto a supermassive black hole, which can result in highly energetic and ...
  • 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 ...