1.
Astrophys J
; 534(2): L185-L188, 2000 May 10.
Article
in English
| MEDLINE
| ID: mdl-10813678
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.
2.
