Browsing by Author "Ourique, Gustavo"
Now showing items 1-14 of 14
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Busca automática de anãs brancas por semelhança espectral
(2014) [Abstract published in event] -
Classificação Espectral de Anãs Brancas
(2013) [Abstract published in event] -
A comparative analysis of the observed white dwarf cooling sequence from globular clusters
(2016) [Journal article]We report our study of features at the observed red end of the white dwarf cooling sequences for three Galactic globular clusters: NGC 6397, 47 Tucanae and M 4. We use deep colour– magnitude diagrams constructed from ... -
Determinação da Idade de Aglomerados Globulares a partir de Simulações de Monte Carlo
(2015) [Abstract published in event] -
Estudo da distribuição de massa das anãs brancas ao redor do Sol
(2016) [Abstract published in event] -
Evidence of spectral evolution on the white dwarf sample from the Gaia mission
(2020) [Journal article]Since the Gaia data release 2, several works have been published describing a bifurcation in the observed white dwarf colour−magnitude diagram for GBP−GRP>0. Some possible explanations in the literature include the existence ... -
Ground-based observation of ZZ Ceti stars and the discovery of four new variables
(2019) [Journal article]We perform ground-based photometric observations of 22 DA white dwarf stars, 10 already known ZZ Cetis and 12 candidates with atmospheric parameters inside the classical instability strip. We report on the discovery of ... -
New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
(2016) [Journal article]We report the discovery of 6576 new spectroscopically confirmed white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12. We obtain Teff, log g and mass for hydrogen atmospherewhite dwarf stars (DAs) ... -
New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
(2015) [Journal article]We report the discovery of 9088 new spectroscopically confirmed white dwarfs and subdwarfs in the Sloan Digital Sky Survey Data Release 10. We obtain Teff, log g and mass for hydrogen atmosphere white dwarf stars (DAs) and ... -
A study of cool white dwarfs in the Sloan Digital Sky Survey Data Release 12
(2019) [Journal article]In this work, we study white dwarfs where 30 000K > Teff > 5000K to compare the differences in the cooling of DAs and non-DAs and their formation channels. Our final sample is composed by nearly 13 000 DAs and more than 3 ... -
Study of cool white dwarf stars
(2019) [Dissertation]White dwarfs stars are the evolutionary endpoint for at least 97% of all stars in the Milky Way. Being the most common stellar fossil, they could be studied as a proxy for Galactic formation and evolution. White dwarfs ... -
Uso de anãs brancas para a determinação de parâmetros físicos de aglomerados globulares
(2016) [Work completion of graduation]Neste trabalho apresentamos um método para determinar parâmetros físicos de aglomerados globulares levando em conta a densidade de estrelas em um mesmo estágio evolutivo, a função de massa inicial e a dispersão fotométrica ... -
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 14
(2019) [Journal article]White dwarfs carry information on the structure and evolution of the Galaxy, especially through their luminosity function and initial-to-final mass relation. Very cool white dwarfs provide insight into the early ages of ... -
White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16
(2021) [Journal article]White dwarfs are the end state of the evolution of more than 97 per cent of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity function and initial-to-final ...
