Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...121..250a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 121, no. 2, May 1983, p. 250-258.
Astronomy and Astrophysics
Astrophysics
36
Cepheid Variables, Stellar Evolution, Stellar Oscillations, Variable Stars, Hertzsprung-Russell Diagram, Metallic Stars, Stellar Gravitation, Stellar Luminosity
Scientific paper
Delta Scuti variable observational data concerning periods, period ratios, effective temperatures, gravities, radii, and metal abundances are compared with novel theoretical stellar evolution sequences, including a pulsation analysis for models in the lower Cepheid instability strip, in order to consider such physical properties as masses, ages, composition parameters, and the occurrence of helium-depleted outer zones. It is established that the metal-rich, high amplitude Delta Scuti variables are shell hydrogen-burning stars, and that the observed period ratios of double mode Delta Scuti variables can be explained by means of homogeneous standard models (although some helium depletion in surface zones is also possible). It is concluded that all evidence is in agreement with the assumption that Delta Scuti stars are evolving in accordance with standard stellar evolutionary theory.
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