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- W2284548854 abstract "Using linear non-adabatic pulsation analysis, we explore the radial-mode (p-mode) stability of stars across a wide range of mass (0.2 <= M <= 50 Msun), composition (0 <= X <= 0.7, Z=0.001, 0.02), effective temperature (3 000 <= T_eff <= 40 000 K), and luminosity (0.01 <= L/M <= 100,000 solar units).We identify the instability boundaries associated with low- to high-order radial oscillations (0 <= n <=16). The instability boundaries are a strong function of both composition and radial order (n). With decreasing hydrogen abundance we find that i) the classical blue edge of the Cepheid instability strip shifts to higher effective temperature and luminosity, and ii) high-order modes are more easily excited and small islands of high radial-order instability develop, some of which correspond with real stars. Driving in all cases is by the classical kappa-mechanism and/or strange modes. We identify regions of parameter space where new classes of pulsating variable may, in future, be discovered. The majority of these are associated with reduced hydrogen abundance in the envelope; one has not been identified previously." @default.
- W2284548854 created "2016-06-24" @default.
- W2284548854 creator A5007841663 @default.
- W2284548854 creator A5088417245 @default.
- W2284548854 date "2016-02-23" @default.
- W2284548854 modified "2023-09-23" @default.
- W2284548854 title "Radial pulsation as a function of hydrogen abundance" @default.
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- W2284548854 doi "https://doi.org/10.1093/mnras/stw388" @default.
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