Paper:	Questioning the Purity of the ZZ Ceti Instability Strip
Volume:	334, 14th European Workshop on White Dwarfs
Page:	459
Authors:	Mukadam, A.S.; Winget, D.E.; von Hippel, T.; Montgomery, M.H.; Kepler, S.O.; Costa, A.F.M.
Abstract:	We use the new ZZ Ceti stars (hydrogen atmosphere white dwarf variables; DAVs) discovered within the Sloan Digital Sky Survey (Mukadam et al. 2004a) to re-define the empirical ZZ Ceti instability strip. This is the first time since the discovery of white dwarf variables in 1968 that we have a statistically significant set of homogeneous spectra of ZZ Ceti stars, acquired using the same detection system and with consistent data reductions. The homogeneity of the spectra reduces the scatter in the spectroscopic temperatures and we find a narrow instability strip of width ~ 950 K, from 10850–11800 K. We question the purity of the instability strip as we find several non-variables within.

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