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Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known
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We observe G117-B15A, the most precise optical clock known, to measure the rate of change of the main pulsation period of this blue-edge DAV white dwarf. Even though the obtained value is only within 1 sigma, Pdot = (2.3 +/- 1.4) x 10^{-15} s/s, it is already constraining the evolutionary timescale of this cooling white dwarf star.
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Cited by 2 Pith papers
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Constraints from parallaxes and average period spacings in the asteroseismic study of 8 DAVs
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Asteroseismic study of KUV03442+0719 with parallax constraints
The pulsations of KUV03442+0719 are fit about as well by a 0.465 M☉ carbon/oxygen-core model plus an unresolved companion as by a 0.270 M☉ helium-core model, so the star's true nature remains ambiguous.
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