Changes of solar luminosity and radius following secular perturbations in the convective envelope

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Abstract

view Abstract Citations (52) References (33) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Changes of solar luminosity and radius following secular perturbations in the convective envelope Endal, A. S. ; Sofia, S. ; Twigg, L. W. Abstract The effect on solar models of several types of slow, spherically symmetric perturbations, acting at various depths within the convective envelope, are calculated. Results are presented on perturbations of the efficiency of convective energy transport (alpha perturbations) and on changes in the nongas component of pressure (beta perturbations). The effects of magnetic fields concentrated near the interface between the radiative core and the convective envelope are explored. It is found that the response and relaxation diagnostics depend both on the type of perturbation and on the depth at which the perturbation is applied. In addition to the general depth dependence, model behavior is sensitive to the presence of major ionization zones near the perturbed layer. The time dependence of the solar model behavior is characterized by an initial hydrostatic reaction followed by a thermal readjustment on a time scale of about 100 years, and finally relaxation to a new thermal equilibrium on a Kelvin time scale. Publication: The Astrophysical Journal Pub Date: March 1985 DOI: 10.1086/163033 Bibcode: 1985ApJ...290..748E Keywords: Convection; Long Term Effects; Radii; Solar Magnetic Field; Stellar Envelopes; Stellar Luminosity; Computational Astrophysics; Energy Transfer; Nonadiabatic Conditions; Solar Physics; Solar Physics full text sources ADS |

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