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    The pulsations of PG 1351+489

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    MNRAS20111220.pdf (1.118Mb)
    Date
    2011-08-01
    Author
    Redaelli, M.
    Wood, Matt A.
    Kepler, S. O.
    Costa, Jörge E. S.
    Winget, Don Earl
    Handler, Gerald
    Castanheira, Bárbara Garcia
    Kanaan, Antonio
    Fraga, Luciano
    Henrique, P.
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    Abstract
    PG 1351+489 is one of the 20 DBVs - pulsating helium-atmosphere white dwarf stars - known and has the simplest power spectrum for this class of star, making it a good candidate to study cooling rates. We report accurate period determinations for the main peak at 489.33448s and two other normal modes using data from the Whole Earth Telescope (WET) observations of 1995 and 2009. In 2009, we detected a new pulsation mode and the main pulsation mode exhibited substantial change in its amplitude compared to all previous observations. We were able to estimate the star's rotation period, of 8.9h, and discuss a possible determination of the rate of period change of (2.0 ± 0.9) × 10-13ss -1, the first such estimate for a DBV.
    URI
    http://hdl.handle.net/11141/405
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