Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.111..355f&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 111, no. 2, April 1985, p. 355-374.
Astronomy and Astrophysics
Astrophysics
29
Cepheid Variables, Hydrodynamic Equations, Light Curve, Stellar Luminosity, Stellar Models, Stellar Oscillations, Amplitudes, Hertzsprung-Russell Diagram, Radiative Transfer, Resonance, Shock Wave Propagation, Stellar Atmospheres, Stellar Envelopes, Stellar Evolution, Traveling Waves
Scientific paper
Models for the nonlinear self-excited pulsations of population-II stars with a solar mass of 0.6, solar luminosities from 128 to 1280, and pulsation periods in the range of 1.3 to 19 days, are studied. It is shown that an increase of the stellar luminosity leads to an increase of the growth rate and the limiting amplitude and to a decrease of the efficiency of the radiative damping region. The following problems are considered: the transition from strictly periodic pulsations to those with a changing period, the nature of a Hertzsprung progression of BL Her-variables, shock waves in the atmospheres of population-II cepheids, and W Vir and TV Tau-variables as the relative objects. Using the pulsation constants, it is found that the theoretical estimates of the luminosities of population-II cepheids coincide with those obtained from observations within 0.25 mag.
Fadeev Iu. A.
Fokin A. B.
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