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Browsing Articles by Author "Demarque, P."
Now showing items 1-14 of 14
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(American Astronomical Society, 2000-03)Detailed models of [alpha] Centauri A and B based on the Hipparcos, Yale, and Soderhjelm parallaxes are compared. The consequences of the uncertainty in mass, luminosity, surface temperature, and composition on the structure ...
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(American Astronomical Society, 2000-02)Inspired by the observations of low-amplitude oscillations of [alpha] Ursae Majoris A by Buzasi et al. using the WIRE satellite, a grid of stellar evolutionary tracks has been constructed to derive physically consistent ...
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(American Astronomical Society and IOP Publishing, 2003-07-10)We construct models of the structure and evolution of the Sun which include variable magnetic fields and turbulence. The magnetic effects are (1) magnetic pressure, (2) magnetic energy, and (3) magnetic modulation to ...
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(American Astronomical SocietyIOP Publishing, 2002-03-10)The general consensus is that in order to reproduce the observed solar p-mode oscillation frequencies, turbulence should be included in solar models. However, until now there has not been any well-tested efficient method ...
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(IOP Publishing Limited, 2014-06-01)We compare evolved stellar models, which match Procyon’s mass and position in the HR diagram, to current groundbased asteroseismic observations. Diffusion of helium and metals along with two conventional core overshoot ...
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The nature of p-modes and granulation in Procyon: new MOST photometry and new Yale convection models (American Astronomical Society, 2008-11)We present new photometry of Procyon, obtained by MOST during a 38 day run in 2007, and frequency analyses of those data. The long time coverage and low point-to-point scatter of the light curve yield an average noise ...
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(American Astronomical Society, 1999-11-01)A grid of stellar evolution models for Procyon A has been calculated. These models include the best physics available to us (including the latest opacities and equation of state) and are based on the revised astrometric ...
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(American Astronomical Society, 1995-06-10)We have studied the importance of the combined effects of rotation, diffusion, and convective overshoot on the p-mode oscillation spectrum and the neutrino flux of the standard solar model. To isolate the various physical ...
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(American Astronomical Society, 1997-01-10)The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the ...
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(American Astronomical Society, 1997-08)The structure of the deep interior of a variety of standard and nonstandard solar models constrained by the low-l p-mode oscillation data from GONG are presented. For standard models, we show that the effects of both helium ...
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(American Astronomical Society, 1996-01)The p-mode frequencies recently observed by Kjeldsen and coworkers, along with other observables, are used to determine the mass, age, and helium abundance of [eta] Bootis. We show, by direct application, how the p-model ...
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(American Astronomical Society, 1996-05-20)The OPAL equation-of-state tables and the MHD equation-of-state tables are utilized in the calculation of new standard solar models that also include helium diffusion. The structure of the models and their l = 0-100 p-mode ...
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(American Astronomical Society, 1998-05-10)We compare the p-mode oscillation spectra of solar models, constructed under the assumption that the universal gravitation constant G varied monotonically over the course of the solar lifetime, to the most recent solar ...
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(Springer Science+Business Media B.V., 2008-08)The stellar evolution code YREC is outlined with emphasis on its applications to helio- and asteroseismology. The procedure for calculating calibrated solar and stellar models is described. Other features of the code such ...
Now showing items 1-14 of 14