Effects of rotation and convection on double-mode and bump cepheids

Journal Article · Tue Aug 01 04:00:00 EDT 1978 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/156331· OSTI ID:6651782

Deupree, R G

The effect of solid-body rotation on the period ratio Pi/sub 1//Pi/sub 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 Pirho/sup 1/2/ 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/sub 2//Pi/sub 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.

• Research Organization: Los Alamos Scientific Laboratory, University of California
• OSTI ID: 6651782
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 223:3; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CEPHEIDS
CONVECTION
ENERGY TRANSFER
FLUID MECHANICS
HEAT TRANSFER
HYDRODYNAMICS
MATHEMATICAL MODELS
MECHANICS
MOTION
PULSATIONS
ROTATION
STAR MODELS
STARS
VARIABLE STARS
VARIATIONS