Seismology Of A Massive Pulsating Hydrogen Atmosphere White Dwarf




Kepler, S. O.
Pelisoli, Ingrid
Pecanha, Viviane
Costa, J. E. S.
Fraga, Luciano
Hermes, J. J.
Winget, D. E.
Castanheira, Barbara
Corsico, A. H.
Romero, A. D.

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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-star = 0.88 +/- 0.02 M-circle dot and T-eff = 12,100 +/- 140 K. These values are consistent with those derived from the the optical spectra and photometric colors.



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Kepler, Souza Oliveira, Ingrid Pelisoli, Viviane Pe�anha, Jose Eduardo da Silveira Costa, Luciano Fraga, James J. Hermes, Donald Earl Winget et al. "Seismology of a Massive Pulsating Hydrogen Atmosphere White Dwarf." The Astrophysical Journal, Vol. 757, No. 2 (Oct., 2012): 177.