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The Origin of the Chemical Elements
The Age of Astronomical Objects
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absorption abundance Aller approximation assumed atoms BBFH beta decay bound-free Burbidge calculations Cameron Chandrasekhar chemical composition CNO cycle computed considered constant contraction conv convective zone core cross-section decay degeneracy density discussed effects electron elements emission energy equation equilibrium evolutionary factor flux Fowler fraction galactic galaxies given globular clusters gradient gravitational Greenstein Hayashi helium Hoyle HR diagram hydrogen hydrogen-burning Ibid increase instability ionization isotopes layers Ledoux light-curves lines of force luminosity magnetic field magnitude main sequence main-sequence mass massive stars Mestel neutrino neutrons novae nuclear reactions nuclei observed obtained opacity oscillations particles perturbation Phys planetesimals pressure problem protons r-process radiation radiative radius ratio red giant region rotation Sandage Schwarzschild solar spectra spectrum stability stellar evolution stellar models supernovae of type surface Table temperature theory thermal tion turbulent variations velocity virial theorem white dwarf