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White dwarf mass distribution in the SDSS
We determined masses for the 7167 DA and 507 DB white dwarf stars classified as single and non-magnetic in Data Release 4 of the Sloan Digital Sky Survey (SDSS). We obtained revised T eff and log gExpand
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Seismological studies of ZZ Ceti stars -I. The model grid and the application to individual stars
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 observedExpand
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Discovery of an ultramassive pulsating white dwarf
We announce the discovery of the most massive pulsating hydrogen-atmosphere (DA) white dwarf (WD) ever discovered, GD 518. Model atmosphere fits to the optical spectrum of this star show it is aExpand
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SDSS white dwarf mass distribution at low effective temperatures
The DA white dwarfs in the Sloan Digital Sky Survey, as analyzed in the papers for Data Releases 1 and 4, show an increase in surface gravity towards lower effective temperatures below 11500 K. WeExpand
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Analysis of IUE spectra of helium-rich white dwarf stars
We studied the class of DB white dwarf stars, using re-calibrated UV spectra for thirty four DBs obtained with the IUE satellite. By comparing the observed energy distributions with modelExpand
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The temporal changes of the pulsational periods of the pre-white dwarf PG 1159-035
Context. PG 1159-035, a pre-white dwarf with Teff � 140 000 K, is the prototype of the PG 1159 spectroscopic class and the DOV pulsating class. Pulsating pre-white dwarf stars evolve rapidly: theExpand
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Pulsating white dwarfs: new insights
Stars are extremely important astronomical objects that constitute the pillars on which the Universe is built, and as such, their study has gained increasing interest over the years. White dwarfExpand
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The rate of cooling of the pulsating white dwarf star G117−B15A: a new asteroseismological inference of the axion mass
ABSTRACT We employ a state-of-the-art asteroseismological model of G117−B15A, the archetypeof the H-rich atmosphere (DA) white dwarf pulsators (also known as DAV or ZZ Cetivariables), and use theExpand
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Asteroseismological measurements on PG 1159-035, the prototype of the GW Virginis variable stars
Aims. An asteroseismological study of PG 1159−035, the prototype of the GW Vir variable stars, has been performed on the basis of detailed and full PG 1159 evolutionary models presented by MillerExpand
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Discovery of eleven new ZZ Ceti stars
We report the discovery of eleven new ZZ Cetis using telescopes at OPD (Observatorio do Pico dos Dias/LNA) in Brazil, the 4.1 m SOAR (Southern Astrophysical Research) telescope at Cerro Pachon,Expand
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