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2000ApJ...534L.185K - Astrophys. J., 534, L185-L188 (2000/May-2)

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

KEPLER S.O., MUKADAM A., WINGET D.E., NATHER R.E., METCALFE T.S., REED M.D., KAWALER S.D. and BRADLEY P.A.

Abstract (from CDS):

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{dot}=(2.3±1.4)x10–15 s.s–1, it is already constraining the evolutionary timescale of this cooling white dwarf star.

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Journal keyword(s): Stars: Evolution - Stars: Individual: Alphanumeric: G117-B15A - Stars: Oscillations

Simbad objects: 1

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