Turbulent convection and pulsational stability of variable stars — IV. The red edge of the δ Scuti instability strip

Using a non-local time-dependent statistical theory of convection, we made a linear pulsational instability analysis for stars in the mass range 1.4-3.0 M-circle dot. The results define a red edge for the delta Scuti instability strip, which fits the observational boundary very well. It is found that the dynamic coupling between convection and oscillation together with the turbulent viscosity are the two main damping mechanisms for low-temperature stars.

[1]  Vicki E. Sherwood,et al.  Variable Stars and Stellar Evolution , 1975 .

[2]  B. Yao.  Unusual variable stars in the globular cluster M4 , 1986 .

[3]  M. Breger.  DELTA SCUTI AND RELATED STARS. , 1979 .

[4]  D. G. Hummer,et al.  The equation of state for stellar envelopes. III - Thermodynamic quantities , 1988 .

[5]  J. E. Tabor,et al.  Non-Pulsating Stars and the Population i and II Instability Strips , 1973 .

[6]  O. Eggen.  The classification of intrinsic variables. VIII. Ultrashort period cepheids. , 1979 .

[7]  A. Sandage.  The vertical height of the horizontal branch: the range in the absolute magnitudes of RR Lyrae stars in a given globular cluster , 1990 .

[8]  F. Rogers,et al.  Radiative atomic Rosseland mean opacity tables , 1992 .

[9]  R. Stellingwerf,et al.  Pulsation in the lower Cepheid strip. I. Linear survey. , 1979 .

[10]  Licai Deng,et al.  Nonlocal Time-dependent Convection Theory , 1997 .

[11]  Chinese Academy of Sciences,et al.  Turbulent convection and pulsational stability of variable stars. II. Oscillations of RR Lyrae and horizontal branch red variable stars , 1998 .

[12]  Dimitri Mihalas,et al.  The equation of state for stellar envelopes. I - An occupation probability formalism for the truncation of internal partition functions , 1988 .

[13]  Xiong.  TURBULENT CONVECTION AND PULSATIONAL STABILITY OF VARIABLE-STARS - NON-PULSATING STARS IN THE CEPHEID STRIP , 2000 .

[14]  David R. Alexander,et al.  Low-Temperature Rosseland Opacities , 1975 .

[15]  R. Bell.  Low Temperature Rosseland Opacities , 1993 .

[16]  Werner Däppen,et al.  The equation of state for stellar envelopes. II - Algorithm and selected results , 1988 .