Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known

Details Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known Evolutionary Timescale of the DAV G117-B15A: The Most Stable Optical Clock Known

2000-03-31

arxiv.org/abs/astro-ph/0003478v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJL

Scientific paper

10.1086/312664

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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