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    Precision Asteroseismology Of The Pulsating White Dwarf Gd 1212 Using A Two-Wheel-Controlled Kepler Spacecraft

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    Date
    2014-07
    Author
    Hermes, J. J.
    Charpinet, S.
    Barclay, Thomas
    Pakstiene, E.
    Mullally, Fergal
    Kawaler, Steven D.
    Bloemen, S.
    Castanheira, Barbara G.
    Winget, D. E.
    Montgomery, Michael H.
    Van Grootel, V.
    Huber, Daniel
    Still, Martin
    Howell, Steve B.
    Caldwell, Douglas A.
    Haas, Michael R.
    Bryson, Stephen T.
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    Abstract
    We present a preliminary analysis of the cool pulsating white dwarf (WD) GD 1212, enabled by more than 11.5 days of space-based photometry obtained during an engineering test of the two-reaction-wheel-controlled Kepler spacecraft. We detect at least 19 independent pulsation modes, ranging from 828.2-1220.8 s, and at least 17 nonlinear combination frequencies of those independent pulsations. Our longest uninterrupted light curve, 9.0 days in length, evidences coherent difference frequencies at periods inaccessible from the ground, up to 14.5 hr, the longest-period signals ever detected in a pulsating WD. These results mark some of the first science to come from a two-wheel-controlled Kepler spacecraft, proving the capability for unprecedented discoveries afforded by extending Kepler observations to the ecliptic.
    Department
    McDonald Observatory
    Subject
    stars: evolution
    stars: individual (gd 1212)
    stars: oscillations
    (including pulsations)
    stars: variables: general
    white dwarfs
    whole earth telescope
    zz-ceti stars
    gravity modes
    light-curve
    g29-38
    pg-1159-035
    instability
    discovery
    g226-29
    period
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34732
    Citation
    Hermes, J. J., St�phane Charpinet, Thomas Barclay, E. Pak�tien?, Fergal Mullally, Steven D. Kawaler, Steven Bloemen et al. "Precision asteroseismology of the pulsating white dwarf GD 1212 using a two-wheel-controlled Kepler spacecraft." The Astrophysical Journal, Vol. 789, No. 1 (Jul., 2014): 85.
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