Other
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phrvd..69h2002b&link_type=abstract
Physical Review D, vol. 69, Issue 8, id. 082002
Other
31
Experimental Tests Of Gravitational Theories, Determination Of Fundamental Constants, Faint Blue Stars, White Dwarfs, Degenerate Stars, Nuclei Of Planetary Nebulae, Variable And Peculiar Stars
Scientific paper
We study the secular variation of the period of nonradial pulsations of white dwarfs when a temporal dependence of the gravitational constant G is assumed. We consider models that reproduce accurately the main characteristics of the best studied DA (hydrogen-rich atmosphere) white dwarf G117-B15A. For this object it has been possible to measure the secular variation of the main observed period of 215.2 s (=2.3±1.4×10-15 s-1) with unprecedented accuracy. Comparing our models with observations we obtain that for Gdot<0 the allowed values are in the range -2.5×10-10 yr-1≲Gdot/G≲0, whereas, for Gdot>0, the allowed values are 0≲Gdot/G≲4.0×10-11 yr-1 at the 2σ confidence level, which are comparable to other bounds established by independent methods. We also show that in order to improve this bound significantly an improvement in the precision of the observed change in which is too large to be reached in the foreseeable future is required.
Benvenuto Omar G.
Garcia-Berro Enrique
Isern Jordi
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