Evolutionary Timescale of the Pulsating White Dwarf G117-B15A: The Most Stable Optical Clock Known
Open Access
- 10 May 2000
- journal article
- research article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 534 (2) , L185-L188
- https://doi.org/10.1086/312664
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, = (2.3 ± 1.4) × 10-15 s s-1, it is already constraining the evolutionary timescale of this cooling white dwarf star.Keywords
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