Browsing Exact and Earth Sciences by Subject "Stars: individual (G117-B15A)"
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Evolutionary timescale of the pulsating white dwarf G117-B15A : the most stable optical clock known
(2000) [Journal article]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 ... -
Measuring the evolution of the most stable optical clock G 117-B15A
(2005) [Journal article]We report our measurement of the rate of change of period with time (˙P ) for the 215 s periodicity in the pulsating white dwarf G 117-B15A, the most stable optical clock known. After 31 years of observations, we have ...