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INSTABILITY DOMAINS of the Beta Cephei and SPB-type with new OP opacities
A. A. Pamyatnykh and T. Zdravkov, Nicolaus Copernicus Astronomical Center, Warsaw, Poland
For considered masses between 2.6 and 40.0 MSun, oscillations for
spherical harmonic degree l ≤ 2 were computed using linear
nonadiabatic code by W. A. Dziembowski (Dziembowski 1977).
The computations were performed using new OP opacities (Seaton 2005)
for new solar heavy element mixture referred as A04 (Asplund et al. 2005).
Three heavy element mass fractions were used: Z=0.020, 0.015, 0.010.
One set of the models was computed for older heavy element
mixture GN93 for Z=0.020 (Grevesse & Noels 1993).
Hydrogen mass fraction for each set was assumed to be X=0.70.
In the computations the mixing-length theory of convection with
alpha(conv)=0.5 was used.
All other details of computations are the same as in Pamyatnykh (1999).
REFERENCES:
- Asplund M., Grevesse N., Sauval A.J., 2004, ASP Conf. Ser, 336, 25
- Dziembowski W., 1977, Acta Astronomica, 27, 95
- Grevesse N., Noels A., 1993, in Pratzo M., Vangioni-Flam E., Casse M., eds.,
Origin and Evolution of the Elements,
Cambridge Univ. Press, p. 15
- Pamyatnykh A.A., 1999, Acta Astr., 49, 119
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DESCRIPTION OF THE COLUMNS in each oscillation file:
| mod | – | model number |
| l | – | the spherical harmonic degree |
| n | – | number of nodes along radius |
| sig | – | non-dimensional frequency |
| P | – | Period, [days] |
| fa[c/d] | – | adiabatic oscillation frequency in [c/d] |
| fn[c/d] | – | nonadiabatic approximation frequency in [c/d] |
| COMPLEX F | – | ratio of the radiative flux perturbation to the radial displacement |
| ekg/ek | – | ratio of the kinetic energy in the gravity-wave propagation zone to the total kinetic energy |
| eta | – | normalized growth-rate [eta changes between +1 (full driving) and -1 (full damping)] |
| Mass | – | mass of the stellar model [MSun] |
| lg Te | – | log10 (effective temperature, [K]) |
| lg L | – | log10 (surface luminosity, [LSun]) |
| lg g | – | log10 (effective gravity, [c.g.s]) |
| Vrot | – | rotational velocity [km/s] (=0.0 in these computations) |
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