Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Gustavo Ourique"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 507:4646-4660
White dwarfs are the end state of the evolution of more than 97% of all stars, and therefore carry information on the structure and evolution of the Galaxy through their luminosity function and initial-to-final mass relation. Examining the new spectr
Autor:
Souza Oliveira Kepler, Gustavo Ourique, Theylor Schumacher Klippel, Detlev Koester, Alejandra D. Romero
Since the Gaia data release 2, several works were published describing a bifurcation in the observed white dwarf colour$-$magnitude diagram for $\mbox{$G_{\mathrm{BP}}$}-\mbox{$G_{\mathrm{RP}}$} > 0$. Some possible explanations in the literature incl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2a3ab42c8a5ac62908d05cae03274021
Autor:
Larissa A Amaral, Cristiane de Paula Oliveira, Gustavo Ourique, Alejandra D Romero, Stephan Geier, Nicole Reindl, Detlev Koester, Ingrid Pelisoli, S O Kepler
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 each population. Examining the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c700bf28f8b658390604141fd7fa43e
http://arxiv.org/abs/1904.01626
http://arxiv.org/abs/1904.01626
Autor:
L. Antunes Amaral, T. Klippel, D. Sanmartim, Souza Oliveira Kepler, Gustavo Ourique, G. R. Lauffer, Alejandra D. Romero, Detlev Koester, Luciano Fraga, Ingrid Pelisoli
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
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 four new variable DA white dwar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::122be536afa46bf125da5c587b36e302
Autor:
Alejandra D. Romero, Detlev Koester, Larissa Antunes Amaral, Souza Oliveira Kepler, Gustavo Ourique
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
In this work we study white dwarfs where $30\,000\,\text{K} {>} \mathrm{T}_{\rm{eff}} {>} 5\,000\,\text{K}$ to compare the differences in the cooling of DAs and non-DAs and their formation channels. Our final sample is composed by nearly $13\,000$ DA
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10db8b07f203f3785d011da8698a72cf
Autor:
Detlev Koester, Ingrid Domingos Pelisoli, Atsuko Nitta, B. Külebi, Paolo Giommi, Patrick Dufour, Daniel J. Eisenstein, Souza Oliveira Kepler, J. E. S. Costa, S. J. Kleinman, Alejandra D. Romero, Gustavo Ourique, Stefan Jordan, Alberto Rebassa-Mansergas
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We report the discovery of 9 089 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 helium atmosphere white dw
Publikováno v:
Science. 352:67-69
Stars born with masses below around 10 solar masses end their lives as white dwarf stars. Their atmospheres are dominated by the lightest elements because gravitational diffusion brings the lightest element to the surface. We report the discovery of
Autor:
Luigi R. Bedin, Pierre Bergeron, Charles Jose Bonatto, Fabíola Campos, J. E. S. Costa, Thayse Adineia Pacheco, Souza Oliveira Kepler, Michael H. Montgomery, Alejandra D. Romero, Donald E Winget, Gustavo Ourique
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
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 archival Hubble Space Telescope
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b87aaadf1babf8a124dd46e4df381286
Publikováno v:
International Journal of Modern Physics: Conference Series. 45:1760023
White dwarf stars are the final stage of most stars, born single or in multiple systems. We discuss the identification, magnetic fields, and mass distribution for white dwarfs detected from spectra obtained by the Sloan Digital Sky Survey up to Data