A comparison between observations and nonlinear models of first overtone mode Cepheids.

Details A comparison between observations and nonlinear models of first overtone mode Cepheids. A comparison between observations and nonlinear models of first overtone mode Cepheids.

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...302..105a&link_type=abstract

Astronomy and Astrophysics, v.302, p.105

Astronomy and Astrophysics

Astrophysics

22

Stars: Variables: Cepheids, Stars: Oscillations

Scientific paper

Light and radial velocity curves of observed first overtone mode Cepheids have been compared with the curves of nonlinear models constructed using the new opacities. The study confirms that the characteristics of the curves depend on the resonance P_1_/P_4_=2 between the first and the fourth overtone mode. However, discrepancies and systematic differences between theory and observations are still present. It is shown that the diagrams of amplitude ratios R_21_ and phase difference φ_21_ of light curves versus the period are sensitive to the T_e_ of the models. Interesting properties of the phase lag between light and radial velocity curve are also discussed.

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