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Linear Pulsation Periods of the Post-AGB Stars

  • M. Takeuti (a1), R. Takano (a1) and S. Tamura (a1)

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There may exist stars during and just after the asymptotic giant branch (AGB) stage. V441 (89) is a candidate star. Fernie and Sasselov (1989) have discussed the evolutionary changes of the pulsation periods based on those of the effective temperature, to compare those with observational data. They used Worell's theorical results (Worell 1986) and have found that the observational changes of the period and the colors are too small compared with the theorical values. To examine the effect of opacities on the pulsations periods, we calculate the periods based on new opacities (OPAL, Iglesias and Rogers 1991), and compare them with the data reported previously.

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References

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Fernie, J.D. 1991, PASP, 105, 1087
Fernie, J.D. and Sasselov, D.D. 1989, PASP, 101, 513
Iglesias, C.A. and Rogers, F.J. 1991, Ap. J., 371, L73
Worell, J.K. 1986 M.N.R.A.S., 223, 787

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