Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..241a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 241-249.
Astronomy and Astrophysics
Astrophysics
37
Cepheid Variables, Stellar Evolution, Stellar Models, Stellar Oscillations, Variable Stars, Helium, Hertzsprung-Russell Diagram, Resonance, Stellar Envelopes
Scientific paper
Standard models having homogeneous envelopes, and series with helium-depleted outer zones, are studied by means of novel theoretical evolution calculations for the variables in the lower Cepheid instability strip. The pulsation periods obtained for full stellar models establish the structure of the central region, and evolutionary tracks are constructed in several diagrams for useful, simple and direct comparisons with observed periods, period ratios, and effective temperatures. Calibrations of the effective temperature-period diagram are shown to provide accurate mass and age determinations for Delta Scuti stars, and Simon's (1979) resonance hypothesis is used to systematically investigate all simple resonances in both standard sequences and series with helium-poor surface zones.
Andreasen Kjoergaard G.
Hejlesen P. M.
Petersen Jørgen Otzen
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