Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..982d&link_type=abstract
Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 982-985. Research supported by the U.S. Department of Energy.
Astronomy and Astrophysics
Astrophysics
8
Cepheid Variables, Convective Flow, Stellar Mass, Stellar Rotation, Adiabatic Conditions, Stellar Evolution, Stellar Models, Velocity Distribution
Scientific paper
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.
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