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.
ApJ , year = 1999, month = may, volume = 516, pages =
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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.