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...

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Detalles Bibliográficos
Autores principales: Kepler, S. O., Pelisoli, Ingrid, Peçanha, Viviane, Costa, J. E. S., Fraga, Luciano, Hermes, J. J., Winget, D. E., Castanheira, Barbara, Córsico, Alejandro Hugo, Romero, Alejandra Daniela, Althaus, Leandro Gabriel, Kleinman, S. J., Nitta, A., Koester, D., Külebi, Baybars, Jordan, Stefan, Kanaan, Antonio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Astronómicas
stars: fundamental parameters
stars: oscillations
white dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84986
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
Descripción
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 4.1m SOAR Telescope, complemented by contemporary McDonald Observatory 2.1m 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 ± 0.02 M and T eff = 12, 100 ± 140 K. These values are consistent with those derived from the optical spectra and photometric colors.

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