R. Smolec i P. Moskalik, Centrum Astronomiczne Mikołaja Kopernika
We present a sample of convective Cepheid models. Models are computed with convective pulsation hydrocode of Smolec & Moskalik (2008). Four sequences of models, lying 300K, 400K, 500K and 600K to the red of the fundamental mode blue edge are presented. Linear properties, static model structures, linear work integrals, as well as nonlinear light curves are given.
Fig 1. Static structure of 4.5 solar masses model, lying 300K to the red of the
fundamental mode blue edge. Red line shows the run of superadiabatic
gradient (Y=nabla-nabla_a) versus the temperature. If Y>0 convective
instability arises and turbulent energies (plotted with blue line) are
generated.
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Fig 2. Normalized, cumulative, linear work integrals for 4.5 solar masses model,
lying 300K to the red of the fundamental mode blue edge. Red line shows
the gas(+radiation) pressure work integral, blue line shows the
eddy-viscous work integral and green line shows the turbulent pressure
work integral. Work integrals are scaled by kinetic energy of the
fundamental mode. Pulsations are driven in a temperature range in which
work integral grows (as temperature gets lower).
[post script]
BIBLIOGRAFIA:
Grevesse N., Noels A., 1993, in Pratzo M., Vangioni-Flam E., Casse M., eds., Origin and Evolution of the Elements, Cambridge Univ. Press, 15
Smolec, R., Moskalik, P, 2008, Acta Astronomica, 58, 193 (SM08)
Szabo, R., Buchler, J.R., Bartee, J. 2007, ApJ, 667, 1150
