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    Finding The Instability Strip For Accreting Pulsating White Dwarfs From Hubble Space Telescope And Optical Observations

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    Date
    2010-02
    Author
    Szkody, Paula
    Mukadam, Anjum
    Gansicke, Boris T.
    Henden, Arne
    Templeton, Matthew
    Holtzman, Jon
    Montgomery, Michael H.
    Howell, Steve B.
    Nitta, Atsuko
    Sion, Edward M.
    Schwartz, Richard D.
    Dillon, William
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    Abstract
    Time-resolved low resolution Hubble Space Telescope ultraviolet spectra together with ground-based optical photometry and spectra are used to constrain the temperatures and pulsation properties of six cataclysmic variables containing pulsating white dwarfs (WDs). Combining our temperature determinations for the five pulsating WDs that are several years past outburst with past results on six other systems shows that the instability strip for accreting pulsating WDs ranges from 10,500 to 15,000 K, a wider range than evident for ZZ Ceti pulsators. Analysis of the UV/optical pulsation properties reveals some puzzling aspects. While half the systems show high pulsation amplitudes in the UV compared to their optical counterparts, others show UV/optical amplitude ratios that are less than one or no pulsations at either wavelength region.
    Department
    Astronomy
    Subject
    stars: dwarf novae
    stars: oscillations
    ultraviolet: stars
    white
    dwarfs
    zz-ceti stars
    nova wz-sagittae
    2001 july outburst
    cataclysmic
    variables
    pq andromedae
    gw-librae
    vw hydri
    spectroscopy
    period
    discovery
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/35018
    Citation
    Szkody, Paula, Anjum Mukadam, Boris T. G�nsicke, Arne Henden, Matthew Templeton, Jon Holtzman, Michael H. Montgomery et al. "Finding the instability strip for accreting pulsating white dwarfs from Hubble Space Telescope and optical observations." The Astrophysical Journal, Vol. 710, No. 1 (Feb., 2010): 64.
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