Equations of state and bump Cepheids. I - Linear results

Details Equations of state and bump Cepheids. I - Linear results Equations of state and bump Cepheids. I - Linear results

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..395k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 395-399.

Astronomy and Astrophysics

Astrophysics

1

Cepheid Variables, Equations Of State, Light Curve, Stellar Oscillations, Stellar Structure, Magnetohydrodynamics, Stellar Models, Velocity Distribution

Scientific paper

The Hummer-Mihalas-Dappen (MHD 1988) and a simple Saha-type equation of state are used to obtain linear pulsation characteristics of a grid of models spanning the Hertz-sprung sequence studied by Cox (1974). The grid of models is taken from Simon and Davis (1983), who used the Los Alamos equation of state in their computations. The result is a sensitivity analysis of theoretical linear bump Cepheid models to the equation of state employed in the calculation. The results obtained with these equations of state are different, although not enough to resolve the Cepheid bump mass discrepancy (Stobie, 1969; Simon and Schmidt, 1976; Simon 1986). Calculations of instability strips, transition regions, and nonlinear models with MHD are currently under way.

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