Evolutionary Timescale of the Pulsating White Dwarf G117-B15A: The Most Stable Optical Clock Known.
THE ASTROPHYSICAL JOURNAL 2000;
534:L185-L188. [PMID:
10813678 DOI:
10.1086/312664]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2000] [Accepted: 03/30/2000] [Indexed: 05/23/2023]
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.
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