Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..184g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 184-187.
Astronomy and Astrophysics
Astronomy
17
Pulsars, Radio Sources (Astronomy), Variable Stars, Gravitational Constant, Pulsar Magnetospheres, Stellar Rotation, Viking Spacecraft
Scientific paper
The use of the observed spin-down rates of radio pulsars to set upper limits on a possible variation of the gravitational constant with cosmic time is discussed. The method applies for pulsars with rates of change of the period, due to matter accretion and to acceleration, which are small compared to the observed spin-down rate. The present method is useful for constraining only the rates of decrease of G and Beta(a) (which measures the ratio between periods of gravitational and atomic clocks). An independent estimate of the pulsar magnetic field is required in order to constrain also the rates of their increase with cosmic time. Application of the method to PSR 0655 + 64 yields limits on the time-variability of G and beta(a) comparable to those derived by Reasenberg (1983) from the Viking range data to Mars, but weaker than those of Hellings et al. (1983) derived from the same data by using a different modeling of the dynamical effects of the asteroids.
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