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American Astronomical Society, Astrophysical Journal, 2(534), p. L185-L188, 2000

DOI: 10.1086/312664

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

Journal article published in 2000 by Souza Oliveira Kepler, Anjum Shagufta Mukadam, Donald Earl Winget, R. Edward Nather, Travis S. Metcalfe, M. D. Reed, Steven D. Kawaler ORCID, Paul A. Bradley
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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 sigma, P&d2;=&parl0;2.3+/-1.4&parr0;x10-15 s s-1, it is already constraining the evolutionary timescale of this cooling white dwarf star.