Convection in pulsating stars. IV - Nonlinear effects

Details Convection in pulsating stars. IV - Nonlinear effects Convection in pulsating stars. IV - Nonlinear effects

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..327s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 1, 1984, p. 327-332.

Astronomy and Astrophysics

Astrophysics

15

Cepheid Variables, Convection, Giant Stars, Stellar Models, Stellar Oscillations, Nonlinear Systems, Stellar Structure, Turbulence

Scientific paper

The nonlinear characteristics of RR Lyrae models containing a nonlocal, time-dependent treatment of convection are discussed. Both fundamental and first-overtone modes are considered. Convection in these models is very weak except for a short time near minimum radius when the two unstable zones merge and convection carries nearly all the flux near the hydrogen ionization zone and 45 percent of the flux in the helium ionization zone. Turbulent pressure work, destabilizing at small amplitude, becomes a stabilizing influence in the nonlinear regime and should act to reduce limiting amplitude.

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