EFFECTS OF CONVECTION ON THE MEAN SOLAR STRUCTURE JØRGEN CHRISTENSEN–DALSGAARD (2009)
Abstract. The overall framework for the study of solar convection and oscillations is the spherically symmetric component of solar structure. I discuss those properties of the solar interior which...
Abstract. The `standard ' solar model is based on a number of simplifying assumptions and depends on knowledge of the physical properties of matter in the Sun. Given these assumptions, the...
Christensen-Dalsgaard Teoretisk, S. Turcotte, Danmarks Grundforskningsfond
Models using the OPAL monochromatic opacities are calibrated to show the effect of detailed diffusion of all elements and of the proposed update of the solar chemical composition on the Sun's...
ASTRONOMY AND ASTROPHYSICS Opacity effects on the solar interior I. Solar structure (2007)
S. C. Tripathy, Danmarks Grundforskningsfond
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
N. Audard, S. Basu, J. Christensen-dalsgaard, Danmarks Grundforskningsfond
We report the results of an investigation into an inversion for a very old star of 0:8 M fi using p modes with ` = 0 \Gamma 3. The structure in the inner 50% by radius is quite well reproduced, as...
Solar Modelswith Non--Standard Chemical Composition (2007)
Turcotte And Christensen-Dalsgaard, S. Turcotte, J. Christensen-dalsgaard, Danmarks Grundforskningsfond
. The OPAL monochromatic opacity tables are used to evaluate the impact of a non-standard chemical composition on solar models. A calibrated olar model with consistent diffusion including the effect...
Teoretisk Astrofysik Center, Danmarks Grundforskningsfond (2007)
S. Turcotte, J. Christensen--dalsgaard, Danmarks Grundforskningsfond
Models of ffCen A and B with diffusion of heavy elements and updated opacities are presented. An analysis of the predicted oscillation frequencies for both stars is made. Some models are considered...
Solar Models With Consistent Diffusion and Monochromatic Opacities (2007)
Sylvain Turcotte, Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond
Introduction Standard solar models now include settling of helium and heavy elements. Some simplifying assumptions are made concerning the settling of heavy elements. The impact of these...
Effects Of Line Asymmetries On The Determination Of Solar Oscillation Frequencies (2007)
J. Christensen-dalsgaard, C. S. Rosenthal, M.J. Thompson, Danmarks Grundforskningsfond
Despite the strong evidence that the peaks in the spectrum of solar oscillations are asymmetric, most determinations of mode frequencies have been based on fits of symmetric Lorentzian profiles to...
The Effect of Diffusion on Pulsations of Stars on the Upper Main Sequence. (2007)
Scuti And Metallic, Main Sequence, Metallic A Stars, S. Turcotte, G. Michaud, Danmarks Grundforskningsfond
. Recent dramatic improvements in the modeling of abundance evolution due to diffusion in A stars have been achieved with the help of monochromatic opacity tables from the OPAL group. An important...
Performance And Early Results From The Golf Instrument Flown On The Soho Mission (2007)
A. H. Gabriel, M. Charra, T. Roca Cortès, ...
. GOLF in-flight commissioning and calibration was carried out during the first four months, most of which represented the cruise phase of SOHO towards its final L1 orbit. The initial performance of...
CONVECTIVE PERTURBATIONS TO SOLAR OSCILLATIONS: THE f MODE (2007)
Colin S. Rosenthal, Jørgen Christensen-Dalsgaard, Åke Nordlund, Regner Trampedach, Danmarks Grundforskningsfond
We describe a variational method for calculating the influence of convective velocity, density, and soundspeed fluctuations on the eigenfrequencies of solar oscillations, under the assumption that...
Near-Surface Effects in Modelling Oscillations of . . . (2007)
Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond, Timothy R. Bedding, Günter Houdek, Hans Kjeldsen, Colin Rosenthal, ...
-pressure perturbation. HYD.a Outer structure obtained from horizontal and temporal averaging of a hydrodynamical convection model (e.g. Stein & Nordlund 1991). This was extended into a...
Solar Structure Inversion With Lowl Data (2007)
Sarbani Basu, Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond, Jesper Schou, Michael J. Thompson, Steven Tomczyk
We present inversion results for the radial hydrostatic structure of the Sun, using six months of oscillation data obtained with the LOWL instrument. This is the first extensive homogeneous set of...
Dipankar Banerjee Indian, Dipankar Banerjee, S. S. Hasan, J. Christensen-dalsgaard, Danmarks Grundforskningsfond
. We examine the effect of a uniform vertical magnetic field on the modes of an isothermal stratified atmosphere. The present investigation is a continuation of earlier work by Hasan &...
Christensen-Dalsgaard And Thompson, Danmarks Grundforskningsfond
. In many cases, oscillating stars rotate so rapidly that second-order effects must be taken into account in analyses of the oscillation frequencies. Such investigations have commonly been based on...
Effects Of Convection On The Mean Solar Structure (2007)
. The overall framework for the study of solar convection and oscillations is the spherically symmetric component of solar structure. I discuss those properties of the solar interior which depend on...
Theoretical Aspects Of Asteroseismology (2007)
Christensen-Dalsgaard Teoretisk, J. Christensen-dalsgaard, Danmarks Grundforskningsfond
Introduction Asteroseismology depends on the ability to determine frequencies for identified modes of stellar oscillation, and to use these frequencies to probe stellar interiors. Thus crucial...
Basic Aspects Of Stellar Structure And Pulsation (2007)
Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond, Woiciech A. Dziembowski, Obserwatorium Astronomiczne, Uniwersytetu Warszawskiego
this paper; his (mostly pertinent) comments have substantially improved the presentation. JC-D was supported in part by the Danish National Research Foundation through the establishment of the...
Tests Of Convective Frequency Effects With Soi/mdi High-Degree Data (2007)
C. S. Rosenthal, J. Christensen-Dalsgaard, A.G. Kosovichev, A. Nordlund, J. Reiter, ...
Advances in hydrodynamical simulations have provided new insights into the effects of convection on the frequencies of solar oscillations. As more accurate observations become available, this may...
ASTRONOMY AND ASTROPHYSICS (2007)
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
Implications of Helioseismology for Stellar Structure and Evolution (1999)
Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond
. The very accurate data now available on solar oscillation frequencies provide stringent constraints on the structure and dynamics of the solar interior, and hence on solar evolution. This is of...
Near-Surface Constraints On The Structure Of Stellar Convection Zones (1997)
Regner Trampedach, Jørgen Christensen-Dalsgaard, Danmarks Grundforskningsfond, Robert F. Stein
. By simulating the convection in the upper layers of six different stars and matching these simulations to 1D-mixing length models using the same input physics, we have been able to infer the...