Asymptotic period spacings plus Gaia parallaxes favor thick hydrogen layers in most of eight DAVs and give an upper limit M_env ≲ 10^{-2.2} for the helium-layer base.
On the formation of DA white dwarfs with low hydrogen contents: Preliminary Results
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abstract
Systematic photometric and asteroseismological studies in the last decade support the belief that white dwarfs in the solar neighborhood harbor a broad range of hydrogen-layer contents. The reasons behind this spread of hydrogen-layer masses are not understood and usually misunderstood. In this work we present, and review, the different mechanisms that can (or cannot) lead to the formation of white dwarfs with a broad range hydrogen contents.
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Constraints from parallaxes and average period spacings in the asteroseismic study of 8 DAVs
Asymptotic period spacings plus Gaia parallaxes favor thick hydrogen layers in most of eight DAVs and give an upper limit M_env ≲ 10^{-2.2} for the helium-layer base.