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Pulsations of stellar models in H and He burning phases

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Abstract

A study of pulsational properties with evolution has been done for a 15.6M ⊙ star withX e =0.90 andY e =0.08. Pulsational properties in the hydrogen-burning stages have been compared with those in helium-burning stages. A comparison with observed characteristics of β Cepheids, classical Cepheids and supergiant variables has been made during the course of its evolution. In addition, models of 5,9 and 15M ⊙ withX e =0.708,Y e =0.272 have also been studied for pulsational properties during the helium burning stage. It is also seen that pulsational instability is sensitive to changes in initial chemical composition and opacity parameters,n ands. A low helium abundance could be a reason for the stability of the models, even when lying in the instability strip of the H-R diagram.

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  1. H. M. Sukhija

    Present address: Bikram College, Patiala, India

Authors and Affiliations

  1. Department of Astronomy and Space Sciences, Punjabi University, Patiala, India

    H. S. Gurm, H. M. Sukhija & J. K. Badalia

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  1. H. S. Gurm
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  2. H. M. Sukhija
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  3. J. K. Badalia
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Gurm, H.S., Sukhija, H.M. & Badalia, J.K. Pulsations of stellar models in H and He burning phases. Astrophys Space Sci 90, 261–276 (1983). https://doi.org/10.1007/BF00650062

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