The effect of different opacity data and chemical element mixture on the Petersen diagram

Details The effect of different opacity data and chemical element mixture on the Petersen diagram The effect of different opacity data and chemical element mixture on the Petersen diagram

2007-11-02

arxiv.org/abs/0711.0276v1

AIPConf.Proc.948:201-206,2007

Astronomy and Astrophysics

Astrophysics

5 pages, 5 figures, 1 table; to be published in the Proceedings of the Conference 'Unsolved Problems in Stellar Physics', Camb

Scientific paper

10.1063/1.2818971

The Petersen diagram is a frequently used tool to constrain model parameters such as metallicity of radial double-mode pulsators. In this diagram the period ratio of the radial first overtone to the fundamental mode, P_1/P_0, is plotted against the period of the fundamental mode. The period ratio is sensitive to the chemical composition as well as to the rotational velocity of a star. In the present study we compute stellar pulsation models to demonstrate the sensitivity of the radial period ratio to the opacity data (OPAL and OP tables) and we also examine the effect of different relative abundances of heavy elements. We conclude that the comparison with observed period ratios could be used successfully to test the opacity data.

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