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    A New ZZ Ceti White Dwarf Pulsator: G30-20

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    2002_11_zzceti.pdf (266.6Kb)
    Date
    2002-11
    Author
    Mukadam, Anjum S.
    Kepler, S. O.
    Winget, D. E.
    Bergeron, P.
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    Abstract
    We report the discovery of a new hydrogen atmosphere variable white dwarf (DAV; ZZ Ceti), G30-20, a high-amplitude, long-period pulsator. The Fourier transform of its light curve shows power around 1050-1125 s. We suspect the existence of multiple periodicities in this region, probably corresponding to different radial order (k) modes, but our observations are not long enough to resolve them. This discovery increases the number of known DAVs to 32. Our best fit to its optical spectrum gives T-eff = 11; 070 +/- 180 K and log g = 7.95 +/- 0.06. This implies that G30-20 is the coolest known DAV.
    Department
    Astronomy
    Subject
    stars : individual (g30-20, wd2347+128)
    stars : oscillations
    stars :
    variables : other
    white dwarfs
    evolutionary time scale
    whole earth telescope
    gravity modes
    stars
    da
    spectrophotometry
    instability
    g117-b15a
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34792
    Citation
    Mukadam, Anjum S., Souza Oliveira Kepler, Donald Earl Winget, and Pierre Bergeron. "A new ZZ Ceti white dwarf pulsator: G30-20." The Astrophysical Journal, Vol. 580, No. 1 (Nov., 2002): 429.
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    © The University of Texas at Austin