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    Seismology Of A Massive Pulsating Hydrogen Atmosphere White Dwarf

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    2012_10_seismology.pdf (713.1Kb)
    Date
    2012-10
    Author
    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.
    Althaus, Leandro
    Kleinman, S. J.
    Nitta, Atsuko
    Koester, Detlev
    Kulebi, Baybars
    Jordan, Stefan
    Kanaan, Antonio
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    Abstract
    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.
    Department
    Astronomy
    Subject
    stars: fundamental parameters
    stars: oscillations
    white dwarfs
    zz-ceti stars
    digital sky survey
    magnetic-fields
    spectroscopic
    analysis
    asteroseismology
    evolution
    instability
    g117-b15a
    mixtures
    search
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34670
    xmlui.dri2xhtml.METS-1.0.item-citation
    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.
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