Seismology of a massive pulsating hydrogen atmosphere white dwarf
We report our observations of the new pulsating hydrogen atmosphere white dwarf SDSS J132350.28+010304.22. We discovered periodic photometric variations in frequency and amplitude that are commensurate with nonradial g-mode pulsations in ZZ Ceti stars. This, along with estimates for the star’s tempe...
| Autores: | , , , , , , , , , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2012 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Sul (UFRGS) |
| Repositorio: | Repositório Institucional da UFRGS |
| Idioma: | inglés |
| OAI Identifier: | oai:www.lume.ufrgs.br:10183/109055 |
| Acceso en línea: | http://hdl.handle.net/10183/109055 |
| Access Level: | acceso abierto |
| Palabra clave: | Anãs brancas Atmosferas estelares Fotometria estelar Pulsacoes estelares Espectros estelares Estrelas variaveis Séries temporais Stars: fundamental parameters Stars: oscillations White dwarfs |
| Sumario: | We report our observations of the new pulsating hydrogen atmosphere white dwarf SDSS J132350.28+010304.22. We discovered periodic photometric variations in frequency and amplitude that are commensurate with nonradial g-mode pulsations in ZZ Ceti stars. This, along with estimates for the star’s temperature and gravity, establishes it as a massive ZZ Ceti star. We used time-series photometric observations with the 4.1 m SOAR Telescope, complemented by contemporary McDonald Observatory 2.1 m data, to discover the photometric variability. The light curve of SDSS J132350.28+010304.22 shows at least nine detectable frequencies. We used these frequencies to make an asteroseismic determination of the total mass and effective temperature of the star: M★ = 0.88±0.02Mʘ and Teff = 12,100±140 K. These values are consistent with those derived from the optical spectra and photometric colors. |
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