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    Pulsational Mapping Of Calcium Across The Surface Of A White Dwarf

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    2010_05_pulsationalmapping.pdf (1.223Mb)
    Date
    2010-05
    Author
    Thompson, Susan E.
    Montgomery, Michael H.
    von Hippel, Ted
    Nitta, Atsuko
    Dalessio, J.
    Provencal, J.
    Strickland, W.
    Holtzman, Jon A.
    Mukadam, Anjum
    Sullivan, D.
    Nagel, T.
    Koziel-Wierzbowska, D.
    Kundera, T.
    Zola, S.
    Winiarski, M.
    Drozdz, M.
    Kuligowska, E.
    Ogloza, W.
    Bognar, Z.
    Handler, G.
    Kanaan, A.
    Ribeira, T.
    Rosen, R.
    Reichart, D.
    Haislip, J.
    Barlow, B. N.
    Dunlap, B. H.
    Ivarsen, K.
    LaCluyze, A.
    Mullally, Fergal
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    Abstract
    We constrain the distribution of calcium across the surface of the white dwarf star G29-38 by combining time-series spectroscopy from Gemini-North with global time-series photometry from the Whole Earth Telescope. G29-38 is actively accreting metals from a known debris disk. Since the metals sink significantly faster than they mix across the surface, any inhomogeneity in the accretion process will appear as an inhomogeneity of the metals on the surface of the star. We measure the flux amplitudes and the calcium equivalent width amplitudes for two large pulsations excited on G29-38 in 2008. The ratio of these amplitudes best fits a model for polar accretion of calcium and rules out equatorial accretion.
    Department
    Astronomy
    Subject
    accretion, accretion disks
    stars: individual (g29-38)
    stars:
    oscillations
    white dwarfs
    zz ceti stars
    whole earth telescope
    oscillating ap stars
    mode-identification
    gravity modes
    g29-38
    spectroscopy
    accretion
    metals
    asteroseismology
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34720
    xmlui.dri2xhtml.METS-1.0.item-citation
    Thompson, Susan E., M. H. Montgomery, T. von Hippel, A. Nitta, J. Dalessio, J. Provencal, W. Strickland et al. "Pulsational Mapping of Calcium Across the Surface of a White Dwarf." The Astrophysical Journal, Vol. 714, No. 1 (May., 2010): 296.
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    • facebook
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