Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..830w&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 830-839.
Astronomy and Astrophysics
Astrophysics
13
Acoustic Properties, Cepheid Variables, Hertzsprung-Russell Diagram, Stellar Models, Stellar Oscillations, Light Curve, Polytropic Processes, Velocity Distribution
Scientific paper
An understanding of the Hertzsprung progression among bump Cepheids is sought in a dualistic viewpoint which combines the idea of propagating pulse echoes with that of modal resonance. Attention is focused on the spherically symmetric pulses that can be regenerated once per cycle if their round trip propagation time equals the period of the overall pulsation. The acoustic properties of polytropic models reveal that the conditions for such reinforcement are likely to be met in models for which the periods of the fundamental and the second overtone pulsation are in the ratio 2:1. Systematic departures from precise resonance may be responsible for the Hertzsprung progression.
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