IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
artículos
Título:
An independent constraint on the secular rate of variation of the gravitational constant from pulsating white dwarfs
Autor/es:
CORSICO, A.H.; ALTHAUS, LEANDRO; GARCÍA-BERRO, ENRIQUE; ROMERO, A. D.
Revista:
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2013 vol. 06 p. 32 - 44
ISSN:
1475-7516
Resumen:
A secular variation of the gravitational constant modifies the structure and evolutionary time scales of white dwarfs. Using an state-of-the-art stellar evolutionary code and an up-to-date pulsational code we compute the effects of a secularly varying G on the pulsational properties of variable white dwarfs. Comparing the the theoretical results obtained taking into account the effects of a running G with the observed periods and measured rates of change of the periods of two well studied pulsating white dwarfs, G117-B15A and R548, we place constraints on the rate of variation of Newton´s constant. We derive an upper bound Ġ/G ~ -1.8 × 10-10 yr-1 using the variable white dwarf G117-B15A, and Ġ/G ~ -1.3 × 10-10 yr-1 using R548. Although these upper limits are currently less restrictive than those obtained using other techniques, they can be improved in a future measuring the rate of change of the period of massive white dwarfs.