Navegação Ciências Exatas e da Terra por Assunto "Estrelas ZZ Ceti"
Resultados 1-12 de 12
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Asteroseismology of PG 1541 + 651 and BPM 31594 with TESS
(2023) [Artigo de periódico]We present the photometric data from TESS for two known ZZ Ceti stars, PG 1541 + 651 and BPM 31594. Before TESS, both objects only had observations from short runs from ground-based facilities, with three and one period ... -
Asteroseismology of ZZ Ceti stars with full evolutionary white dwarf models : II. The impact of AGB thermal pulses on the asteroseismic inferences of ZZ Ceti stars
(2018) [Artigo de periódico]Context. The thermally pulsing phase on the asymptotic giant branch (TP-AGB) is the last nuclear burning phase experienced by most low- and intermediate-mass stars. During this phase, the outer chemical stratification above ... -
Asteroseismology of ZZ Ceti stars with fully evolutionary white dwarf models : I. the impact of the uncertainties from prior evolution on the period spectrum
(2017) [Artigo de periódico]Context. ZZ Ceti stars are pulsating white dwarfs with a carbon-oxygen core build up during the core helium burning and thermally pulsing Asymptotic Giant Branch phases. Through the interpretation of their pulsation periods ... -
Discovery of eleven new ZZ Ceti stars
(2006) [Artigo de periódico]We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observatório do Pico dos Dias/LNA) in Brazil, the 4.1 m SOAR (Southern Astrophysical Research) telescope at Cerro Pachon, Chile, and the 2.1 m Otto ... -
Ground-based observation of ZZ Ceti stars and the discovery of four new variables
(2019) [Artigo de periódico]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 developments of the ZZ Ceti instability strip : the discovery of 11 new variables
(2010) [Artigo de periódico]Using the The SOuthern Astrophysical Research (SOAR) 4.1-m telescope, we report on the discovery of low amplitude pulsations for three stars previously reported as not-observed-tovary (NOV) by Mukadam et al. and Mullally ... -
Probing the structure of Kepler ZZ Ceti stars with full evolutionary models-based asteroseismology
(2017) [Artigo de periódico]We present an asteroseismological analysis of four ZZ Ceti stars observed with the Kepler spacecraft: GD 1212, SDSS J113655.17+040952.6, KIC 11911480, and KIC 4552982, based on a grid of full evolutionary models of DA white ... -
Seismological studies of ZZ Ceti stars - II. Application to the ZZ Ceti class
(2009) [Artigo de periódico]We used the detected pulsation modes and adiabatic pulsation models to do seismology of the class of ZZ Ceti stars and measure the H layer mass for 83 stars. We found the surface hydrogen layer to be within the range 10−9.5 ... -
Seismological studies of ZZ Ceti stars - I. The model grid and the application to individual stars
(2008) [Artigo de periódico]We calculate and explore an extensive adiabatic model grid for pulsating white dwarfs with hydrogen-dominated atmospheres, the ZZ Ceti stars. We also compared the computed modes with the observed ones for fiveZZCeti stars ... -
The rate of cooling of the pulsating white dwarf star G117−B15A : a new asteroseismological inference of the axion mass
(2012) [Artigo de periódico] -
Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models
(2012) [Artigo de periódico]ZZ Ceti stars form the most numerous group of degenerate variable stars. They are otherwise normal DA (H-rich atmospheres) white dwarfs that exhibit pulsations. Here, we present an asteroseismological analysis for 44 bright ... -
Whole Earth Telescope observations of the hot helium atmosphere pulsating white dwarf EC 20058−5234
(2008) [Artigo de periódico]We present the analysis of a total of 177 h of high-quality optical time-series photometry of the helium atmosphere pulsating white dwarf (DBV) EC 20058−5234. The bulk of the observations (135 h) were obtained during a WET ...
