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  • BATISTA SOUZA, TIAGO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2015-11-04)
    Massive stars are very complex objects and up to now their evolution is not well understood yet. Among the massive stars, the Classical Be stars are the subject of this dissertation. They are B-type, non-supergiants stars, ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • HUANCA CONDORI, CESAR AUGUSTO (Observatorio NacionalDivisão de Programas de Pós-Graduação - DIPPGBrasilONPrograma de Pós-Graduação em Astronomia, 2014-04-30)
    Apesar dos avanços nos modelos de evolução estelar, ainda existem fases curtas da vida de estrelas de diferentes massas que não são bem conhecidas, sendo que algumas delas não estão até mesmo incluídas nas trilhas evolutivas. ...
  • 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, 2014-03-26)
    Some evolved massive objects are poorly understood by science, like Luminous Blue Variables (LBVs), which are the main focus of this dissertation. These objects are mainly characterized by episodes of intense mass loss, ...
  • 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. ...
  • 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 ...