Post-common-envelope helium white dwarfs with thin hydrogen envelopes cool in roughly 0.3 to 2 billion years, while thicker envelopes sustain hydrogen burning and keep the star bright for billions of years.
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Post-common Envelope Evolution of Helium-core White Dwarfs
Post-common-envelope helium white dwarfs with thin hydrogen envelopes cool in roughly 0.3 to 2 billion years, while thicker envelopes sustain hydrogen burning and keep the star bright for billions of years.