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Title:
Constraining the Surface Inhomogeneity and Settling Times of Metals on Accreting White Dwarfs
Authors:
Montgomery, M. H.; Thompson, S. E.; von Hippel, T.
Affiliation:
AA(Department of Astronomy, University of Texas at Austin, Austin, TX; .; Delaware Asteroseismic Research Center, Mt. Cuba Observatory, Greenville, DE.), AB(Delaware Asteroseismic Research Center, Mt. Cuba Observatory, Greenville, DE.; Department of Physics and Astronomy, University of Delaware, Newark, DE.), AC(Department of Astronomy, University of Texas at Austin, Austin, TX; .; Department of Physics, Siena College, Loudonville, NY.)
Publication:
The Astrophysical Journal, Volume 685, Issue 2, pp. L133-L136. (ApJL Homepage)
Publication Date:
10/2008
Origin:
UCP
ApJ Keywords:
Accretion, Accretion Disks, Convection, Diffusion, Stars: Oscillations, Stars: Variables: Other, Stars: White Dwarfs
DOI:
10.1086/592731
Bibliographic Code:
2008ApJ...685L.133M

Abstract

Due to the short settling times of metals in DA white dwarf atmospheres, any white dwarfs with photospheric metals must be actively accreting. It is therefore natural to expect that the metals may not be deposited uniformly on the surface of the star. We present calculations showing how the temperature variations associated with white dwarf pulsations lead to an observable diagnostic of the surface metal distribution, and we show what constraints current data sets are able to provide. We also investigate the effect that time-variable accretion has on the metal abundances of different species, and we show how this can lead to constraints on the gravitational settling times.
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