A nonlinear study of AI Velorum

  • A. N. Cox
  • S. W. Hodson
1. δ Scuti Stars
Part of the Lecture Notes in Physics book series (LNP, volume 125)


Using results from earlier studies of double-mode dwarf Cepheids by Cox, King and Hodson (1979), hydrodynamic calculations have been undertaken for AI Vel. The evolution theory mass of 1.8 M previously derived, together with a luminosity of 23 L and a Te of 7500 K, give the observed period of 0.11 day and the observed period ratio π10 = 0.773. Although the observed Te was 7620 K, a cooler Te is used due to the former's location at the fundamental pulsation mode blue edge. The composition used i s X = 0.70, Z = 0.01--a Z value 1 lower than normal i n order to make the period ratio as large as that observed. The goal is to see if double-mode behavior, due to either mode switching or a permanent state, can be predicted for the model. Progress in converging the model to a periodic pulsation solution by the von Sengbusch-Stellingwerf relaxation method is discussed.


Mode Switching Surface Helium Blue Edge Period Ratio Instability Strip 
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Copyright information

© Springer-Verlag 1980

Authors and Affiliations

  • A. N. Cox
    • 1
  • S. W. Hodson
    • 1
  1. 1.Theoretical DivisionLos Alamos Scientific Laboratory of the University of CaliforniaLos AlamosNew Mexico

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