Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....45..287h&link_type=abstract
Astronomy and Astrophysics, vol. 45, no. 2, Dec. 1975, p. 287-296.
Astronomy and Astrophysics
Astrophysics
4
Atmospheric Models, Cepheid Variables, Stellar Atmospheres, Stellar Spectra, Astronomical Models, Line Shape, Pulsed Radiation, Radial Velocity
Scientific paper
The method of fine analysis is used to construct 'quasi-hydrostatic' model atmospheres for delta Cep at two phases. In calculating these models, the time-dependent terms of the hydrodynamic equations are neglected, but the depth dependence of the pulsational velocity fields is included in a modified hydrostatic equation. The depth dependence of the pulsational velocity is determined from the empirical correlation between equivalent widths and radial velocities of metallic lines, from the asymmetry of line profiles, and from curve-of-growth analysis. The final radiative-equilibrium models are presented, and the results are compared with observations. The comparisons show that: (1) the computed color indices are in good agreement with the observed values corrected for interstellar reddening; (2) there are no significant differences between the elemental abundances determined from the analysis and the solar abundances; (3) the mean radius of delta Cep is about 28.5 million km and its mean mass is about 5.4 solar masses; and (4) the time variations of pulsational velocity and depth are in phase, indicating the presence of a running wave.
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