Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975mnras.170..155p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 170, Jan. 1975, p. 155-163.
Astronomy and Astrophysics
Astronomy
8
Astronomical Models, Cepheid Variables, Dwarf Stars, Stellar Envelopes, Abundance, Adiabatic Conditions, Boundary Conditions, Boundary Value Problems, Convection, Radiation Pressure, Stellar Atmospheres, Stellar Evolution, Stellar Structure
Scientific paper
A linear nonadiabatic pulsation analysis of models of dwarf Cepheid variable stars has been carried out. The models include convection, radiation pressure, surface boundary condition determined from model atmospheres, and opacity determined either analytically or by quadratic interpolation in tables. The results have been compared with observations by using a temperature-color relation and a period-density relation, assuming that the masses of the stars are 0.5 solar mass. Best agreement between theory and observations occurs if the hydrogen content by weight is between 0.70 and 0.75. The problem of the evolutionary state of these stars is discussed briefly.
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