Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Romero, Alejandra Daniela"'
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
Externí odkaz:
http://arxiv.org/abs/1702.01134
Autor:
Kepler, S. O., Koester, Detlev, Romero, Alejandra Daniela, Ourique, Gustavo, Pelisoli, Ingrid
We present the mass distribution for all S/N > 15 pure DA white dwarfs detected in the Sloan Digital Sky Survey up to Data Release 12, fitted with Koester models for ML2/alpha=0.8, and with Teff > 10 000 K, and for DBs with S/N >10, fitted with ML2/a
Externí odkaz:
http://arxiv.org/abs/1610.00371
Autor:
Kepler, S. O., Pelisoli, Ingrid, Koester, Detlev, Ourique, Gustavo, Romero, Alejandra Daniela, Reindl, Nicole, Kleinman, Scot J., Eisenstein, Daniel J., Valois, A. Dean M., Amaral, Larissa A.
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 atmosphere white dwarf stars (DAs) and helium atmosphere white
Externí odkaz:
http://arxiv.org/abs/1510.08409
Autor:
Kepler, S. O., Pelisoli, Ingrid, Koester, Detlev, Ourique, Gustavo, Kleinman, Scot J., Romero, Alejandra Daniela, Nitta, Atsuko, Eisenstein, Daniel J., Costa, José Eduardo da Silveira, Külebi, Baybars, Jordan, Stefan, Dufour, Patrick, Giommi, Paolo, Rebassa-Mansergas, Alberto
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
Externí odkaz:
http://arxiv.org/abs/1411.4149
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
One of the largest uncertainties in stellar evolutionary computations is the accuracy of the considered reaction rates. The 12C(α, γ ) 16O reaction is particularly important for the study of low- and intermediate-mass stars as it determines the fin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::3dc628a199362f8b316cb6c70cd69c91
Autor:
Kepler, Souza Oliveira, Koester, Detlev, Pelisoli, Ingrid Domingos, Romero, Alejandra Daniela, Ourique, Gustavo
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
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 mass relation. Examining the ne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::14ca2955bf1a2add067e24812b214ca0
Autor:
Ourique, Gustavo, Kepler, Souza Oliveira, Romero, Alejandra Daniela, Klippel, Theylor Schumacher, Koester, Detlev
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
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 of a double populatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::6db33bc8cf9b2b8e8ed53a0cc81f265e
Autor:
Romero, Alejandra Daniela, Amaral, Larissa Antunes, Kepler, Souza Oliveira, Fraga, Luciano, Kurtz, Donald W., Shibahashi, Hiromoto
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 detection of periodic variations on the Teff 32 000 K DA white dwarf star HE 1017−1352. We obtained time series photometry using the 4.1-m Southern Astrophysical Research telescope on three separate nights for a total of 16.8 h. From
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::e199c660932abed9bb14ee8003f14781
Autor:
Kepler, Souza Oliveira, Pelisoli, Ingrid Domingos, Koester, Detlev, Reindl, Nicole, Geier, Stephan, Romero, Alejandra Daniela, Ourique, Gustavo, Oliveira, Cristiane de Paula, Amaral, Larissa Antunes
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
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=od______3056::0cb44c787fb8c94f77c290601a79dfed
Autor:
Romero, Alejandra Daniela, Kepler, Souza Oliveira, Joyce, Simon R. G., Ramos, Gabriel Lauffer, Córsico, Alejandro Hugo
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 present a study of the dependence of the mass–radius relation for DA white dwarf stars on the hydrogen envelope mass and the impact on the value of log g, and thus the determination of the stellar mass. We employ a set of full evolutionary carbo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::9aed63947e0b1e6cff74e0a472883b23