Asteroseismological bound on Ġ/G from pulsating white dwarfs

Omar G. Benvenuto, Enrique García-Berro, and Jordi Isern
Phys. Rev. D 69, 082002 – Published 6 April 2004
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Abstract

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±1.4×1015s1) with unprecedented accuracy. Comparing our models with observations we obtain that for Ġ<0 the allowed values are in the range 2.5×1010yr1Ġ/G0, whereas, for Ġ>0, the allowed values are 0Ġ/G4.0×1011yr1 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.

  • Received 24 July 2003

DOI:https://doi.org/10.1103/PhysRevD.69.082002

©2004 American Physical Society

Authors & Affiliations

Omar G. Benvenuto1,2, Enrique García-Berro3,4, and Jordi Isern4,5

  • 1Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque s/n, (1900) La Plata, Argentina
  • 2Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Vicuña Mackenna 4860, Casilla 306, Santiago 22, Chile
  • 3Departament de Física Aplicada, Universitat Politècnica de Catalunya, Escola Politècnica Superior de Castelldefels, Avda. del Canal Olímpic s/n, Edifici PMT–A, 08860 Castelldefels, Spain
  • 4Institut d’Estudis Espacials de Catalunya, Edifici Nexus, Gran Capitán 2-4, 08034 Barcelona, Spain
  • 5Institut de Ciències de l’Espai, Barcelona, Spain

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Issue

Vol. 69, Iss. 8 — 15 April 2004

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