Evolutionary timescale of the pulsating white dwarf G117-B15A : the most stable optical clock known

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2000
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http://hdl.handle.net/10183/108887
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Abstract
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 σ, P = (2.3±1.4) x 10 -15 s s-ˡ, it is already constraining the evolutionary timescale of this cooling white dwarf star.
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The astrophysical journal. Chicago. Vol. 534, no. 2 pt. 2 (May 2000), p. L185-L188
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