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The Pulsating White Dwarf G117-B15A: Still the Most Stable Optical Clock Known

16 Feb 2021, 17:00 UTC
The Pulsating White Dwarf G117-B15A: Still the Most Stable Optical Clock Known
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S. O. Kepler et al 2021 ApJ 906 7
The pulsating hydrogen atmosphere white dwarf star G 117-B15A, observed since 1974, has a stable pulsation period that varies by only 1 second in 6.2 million years, making it an exceptional optical clock.

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