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Last name: PROVOST
First name: J.
Astrophysics and Space Science, 316, pp. 135-140, http://dx.doi.org./10.1007/s10509-007-9654-x
A solar model which includes the plausible presence of a mild mixing in the solar inner radiative zone is presented. The model takes into account the inhibition of turbulent motions. The properties of the model are compared to the standard model properties and to observational results: the turbulent diffusion mixing (TDM) improves the results...
International audience
A solar model which includes the plausible presence of a mild mixing in the solar inner radiative zone is presented. The model takes into account the inhibition of turbulent motions. The properties of the model are compared to the standard model properties and to observational results: the turbulent diffusion mixing (TDM) improves the results...
This paper examines the effects of axial-vector coupling constant g(A) changes on the outputs of solar-models (such as helium content, neutrino fluxes, and oscillations), using existing 'calibrated' solar models and assuming that the other inputs of the models are well-known. The results suggest that a very high value of g(A) (greater than...
Helioseismic inversions, carried out for several years on various ground-based and spatial observations, have shown that the solar rotation rate presents two principal regimes: a quasi-rigid rotation in the radiative interior and a latitude-dependent rotation in the whole convection zone. The thin layer, named solar tachocline, between these...
Astrophysics and Space Science, p. 200 (2009)
Results on the effects of microscopic diffusion on the modeling and oscillations of solar-like stars are discussed. Comparisons between models with and without microscopic diffusion, subjected to observational constraints, namely effective temperature, luminosity, surface metallicity and mass derived from photometry, spectroscopy and...
International audience
Observations of surface oscillations of the Sun can be analyzed to probe the solar interior. We use data obtained by the LOWL instrument (LOWL is an abbreviation for low degree with degree denoted by L) installed on Mauna Loa, Hawaii, since 1994 to investigate solar internal rotation. A 2 Dimensional Regularized Least-Squares (2D RLS) inverse...
Inversions of rotational splittings have shown that there exists at the base of the solar convection zone a region called the tachocline in which high radial gradients of the rotation rate occur. The usual linear regularization methods tend to smooth out any high gradients in the solution, and may not be appropriate for the study of this zone....
Inversions of rotational splittings have shown that the surface layers and the so-called solar tachocline at the base of the convection zone are regions in which high radial gradients of the rotation rate occur. The usual regularization methods tend to smooth out every high gradients in the solution and may not be appropriate for the study of a...
A 2-D regularized least square inversion code for solar rotation has been constructed which approximates the rotation rate by piecewise polynomials projected on B-splines. It is applied to the rotational splitting data of BBSO (Ref. 1). A discussion of the in uence of the number and order of the splinebasis on the results is given. Preliminary...
Astronomy and Astrophysics, 469, pp. 1145-1149, http://dx.doi.org./10.1051/0004-6361:7212
Context. Recently the triple-α reaction rate has been re-evaluated. In the temperature range, 107-108 K, with respect to the NACRE rate, the new rate is enhanced by up to 20 orders-magnitude. Aims: To validate this new rate, we investigate its consequences for the evolution of Cepheid models. Methods: The stellar evolutionary tracks are...
Detailed evolutionary models of the visual binary alpha Centauri, including pre main-sequence evolution, have been performed using the masses recently determined by Pourbaix et al. (1999). Models have been constructed using the CEFF equation of state, OPAL opacities, NACRE thermonuclear reaction rates and microscopic diffusion. A...
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Astrononomy and Astrophysics Meeting, eds. M. Giard, F. Casoli and F. Paletou, EAS Publications Series 14, pp. 285-290 (2005)
Science, 316, pp. 1591-, http://dx.doi.org./10.1126/science.1140598
Astrophysics and Space Science, 316, pp. 1-4, http://dx.doi.org./10.1007/s10509-008-9771-1
Evolution of the 7Li abundance in the convection zone of the Sun during different stages of its life time is considered to explain its low photospheric value in comparison with that of the solar system meteorites. Lithium is intensively and transiently burned in the early stages of evolution (pre-main sequence, pMS) when the radiative core...
Astronomische Nachrichten, 329, p. 476, http://dx.doi.org./10.1002/asna.200710980
In order to make asteroseismology a powerful tool to explore stellar interiors, different numerical codes should give the same oscillation frequencies for the same input physics. Any differences found when comparing the numerical values of the eigenfrequencies will be an important piece of information regarding the numerical structure of the...