ON SECOND HELIUM IONIZATION AS A CAUSE OF PULSATIONAL INSTABILITY IN STARS
Journal Article
·
· Astrophysical Journal (U.S.)
This investigation was to test the hypothesis that He+ ionization in the envelope is the source of the instability in cepheid variables and possibly also in other types of pulsating stars. Numerical solutions of the complete set of linearized, nonadiabatic pulsation equations were obtained for a large number of simplified stellar envelope models in radiative equilibrium. The solutions were used to compute the (negative) dissipation in the envelopes and to estimate the (positive) dissipation in the interiors. The parameter values were chosen so that the envelopes correspond approximately to classical cepheids, RR Lyrae variables, W Virginis variables, and zero-age mainsequence stars in the middle and late A's. (auth)
- Research Organization:
- Joint Inst. for Lab. Astrophys., Boulder, Colo.
- NSA Number:
- NSA-17-039821
- OSTI ID:
- 4639482
- Journal Information:
- Astrophysical Journal (U.S.), Journal Name: Astrophysical Journal (U.S.) Vol. Vol: 138; ISSN ASJOA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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