A possible interpretation of subgiant Delta Scuti variables

Details A possible interpretation of subgiant Delta Scuti variables A possible interpretation of subgiant Delta Scuti variables

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....73..329v&link_type=abstract

Astronomy and Astrophysics, vol. 73, no. 3, Mar. 1979, p. 329-336.

Astronomy and Astrophysics

Astrophysics

14

Abundance, Giant Stars, Helium, Stellar Models, Variable Stars, Boundary Value Problems, Chemical Composition, Hydrogen Ions, Radiation Pressure, Stellar Envelopes, Stellar Gravitation

Scientific paper

The giant Delta Scuti stars with abundance anomalies cannot be explained in the framework of the theory of A stars on the main sequence. The existence of abundance anomalies leads to the idea that they are differentiated stars in which heavy elements have been pushed upward by radiation pressure. In this case helium is bound to be driven downward by gravitation from the outer layers; the helium convection zones disappear and, thus, cannot account for vibrational instability. This paper investigates whether this vibrational instability can be due to the hydrogen ionization zone. A marginal positive result is obtained, and the uncertainties in the physics of the model are discussed.

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