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Title: Radial stellar pulsation and three-dimensional convection. III. Comparison of two-dimensional and three-dimensional convection effects on radial pulsation

We have developed a multi-dimensional radiation hydrodynamics code to simulate the interaction of radial stellar pulsation and convection for full-amplitude pulsating models. Convection is computed using large eddy simulations. Here, we perform three-dimensional (3D) simulations of RR Lyrae stars for comparison with previously reported 2D simulations. We find that the time-dependent behavior of the peak convective flux on pulsation phase is very similar in both the 2D and 3D calculations. The growth rates of the pulsation in the 2D calculations are about 0.1% higher than in the 3D calculations. The amplitude of the light curve for a 6500 K RR Lyrae model is essentially the same for our 2D and 3D calculations, as is the rising light curve. There are differences in the slope at various times during falling light.
Authors:
 [1] ;  [2]
  1. Now at Physics and Astronomy, University of Exeter, Stocker Road, Exeter, UK EX4 4QL. (United Kingdom)
  2. Institute for Computational Astrophysics and Department of Astronomy and Physics, Saint Mary's University, Halifax, NS B3H 3C3 Canada (Canada)
Publication Date:
OSTI Identifier:
22351567
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AMPLITUDES; COMPARATIVE EVALUATIONS; CONVECTION; HYDRODYNAMICS; INTERACTIONS; LARGE-EDDY SIMULATION; OSCILLATIONS; PULSATIONS; STARS; THREE-DIMENSIONAL CALCULATIONS; TIME DEPENDENCE; TWO-DIMENSIONAL CALCULATIONS; VISIBLE RADIATION