Abstract
view Abstract Citations (8) References (30) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The effects of rotation and convection on double-mode and bump cepheids. Deupree, R. G. Abstract The effect of solid-body rotation on the period ratio Pi(1)/Pi(0) is studied with a two-dimensional, nonlinear, adiabatic hydrodynamics code in an effort to reduce or remove the discrepancies found between evolutionary masses for Cepheids and the masses determined by application of the Pi-square root of rho relation to the two modes of double-mode Cepheids. The changes in period ratio found are far too small to reconcile the masses determined from pulsation theory with those of evolution theory. The application of the period ratio Pi(2)/Pi(0) to the bump Cepheids is based on the stimulated second overtone result of Simon and Schmidt; however, this was derived only for radiative models. We therefore applied our time-dependent convection-pulsation hydrodynamics code to a bump Cepheid model to examine the effects of convection on the existence of a bump. While there is evidence that such effects are present, convection cannot remove the mass discrepancy. Publication: The Astrophysical Journal Pub Date: August 1978 DOI: 10.1086/156331 Bibcode: 1978ApJ...223..982D Keywords: Cepheid Variables; Convective Flow; Stellar Mass; Stellar Rotation; Adiabatic Conditions; Stellar Evolution; Stellar Models; Velocity Distribution; Astrophysics; Cepheids:Convection; Cepheids:Rotation full text sources ADS |
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