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    SDSS J142625.71+575218.3: the First Pulsating White Dwarf With A Large Detectable Magnetic Field

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    Date
    2008-08
    Author
    Dufour, P.
    Fontaine, G.
    Liebert, J.
    Williams, K.
    Lai, D. K.
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    Abstract
    We report the discovery of a strong magnetic field in the unique pulsating carbon- atmosphere white dwarf SDSS J142625.71 + 575218.3. From spectra gathered at the MMT and Keck telescopes, we infer a surface field of B(s) similar or equal to 1.2 MG, based on obvious Zeeman components seen in several carbon lines. We also detect the presence of a Zeeman- splitted He I lambda 4471 line, which is an indicator of the presence of a nonnegligible amount of helium in the atmosphere of this "hot DQ" star. This is important for understanding its pulsations, as nonadabatic theory reveals that some helium must be present in the envelope mixture for pulsation modes to be excited in the range of effective temperature where the target star is found. Out of nearly 200 pulsating white dwarfs known today, this is the first example of a star with a large detectable magnetic field. We suggest that SDSS J142625.71 + 575218.3 is the white dwarf equivalent of a rapidly oscillating Ap star.
    Department
    Astronomy
    Subject
    stars : abundances
    stars : atmospheres
    stars : individual (sdss
    j1426+5752)
    stars : magnetic fields
    dynamo generation
    feige-7
    gd-358
    stars
    rich
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/42989
    Citation
    Dufour, P., G. Fontaine, James Liebert, Kurtis Williams, and David K. Lai. "SDSS J142625. 71+ 575218.3: the first pulsating white dwarf with a large detectable magnetic field." The Astrophysical Journal Letters, Vol. 683, No. 2 (Aug., 2008): L167.
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    • facebook
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    © The University of Texas at Austin