Výsledky vyhledávání - "Kepler, Souza Oliveira"

Pulsating hydrogen-deficient white dwarfs and pre-white dwarfs observed with TESS : IV. Discovery of two new GW Vir stars : TIC 0403800675 and TIC 1989122424

Autor: Uzundag, Murat, Córsico, Alejandro Hugo, Kepler, Souza Oliveira, Althaus, Leandro Gabriel, Werner, Klaus, Reindl, Nicole, Vuckovic, Maja

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present two new GW Vir-type pulsating white dwarf stars, TIC 0403800675 (WD J115727.68-280349.64) and TIC 1989122424 (WD J211738.38-552801.18) discovered in the Transiting Exoplanet Survey Satellite (TESS) photometric data. For both stars, the TES

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The impact of the uncertainties in the 12C(α, γ ) 16O reaction rate on the evolution of low- to intermediate-mass stars

Autor: Pepper, Ben Thomas, Istrate, Alina G., Romero, Alejandra Daniela, Kepler, Souza Oliveira

Publikováno v: Repositório Institucional da 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

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The pulsating helium-atmosphere white dwarfs : I. New DBVs from the Sloan Digital Sky Survey

Autor: Vanderbosch, Zachary, Hermes, James J., Winget, Donald Earl, Montgomery, Michael Houston, Bell, Keaton, Nitta, Atsuko, Kepler, Souza Oliveira

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present a dedicated search for new pulsating helium-atmosphere (DBV) white dwarfs from the Sloan Digital Sky Survey using the McDonald 2.1 m Otto Struve Telescope. In total we observed 55 DB and DBA white dwarfs with spectroscopic temperatures bet

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White dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 16

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

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

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Convection and rotation boosted prescription of magnetic braking application to the formation of extremely low-mass white dwarfs

Autor: Soethe, Leonardo Taynô Tosetto, Kepler, Souza Oliveira

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

Extremely low-mass white dwarfs (ELM WDs) are the result of binary evolution in which a low-mass donor star is stripped by its companion leaving behind a helium-core white dwarf (WD). We explore the formation of ELM WDs in binary systems considering

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Gaia white dwarfs within 40 pc : I. Spectroscopic observations of new candidates

Autor: Tremblay, Pier-Emmanuel, Kepler, Souza Oliveira, Torres, Sergio

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from Gaia Data Release 2 (DR2) and in almost all cases, had no prio

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SDSS J124043.01+671034.68 : the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?

Autor: Gänsicke, Boris, Koester, Detlev, Raddi, Roberto, Toloza, Odette F., Kepler, Souza Oliveira

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal pulse or binary interactions

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Evidence of spectral evolution on the white dwarf sample from the Gaia mission

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

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

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Pulsation in the white dwarf HE 1017−1352

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

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

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