Evolution of Stars and Stellar Populations by Maurizio Salaris

By Maurizio Salaris

Salaris (Astrophysics examine Institute, Liverpool John Moorse collage, united kingdom) and Cassisi (Astronomic Observatory of Collurania, Italy) current the idea of stellar evolution and its software to the research of stellar populations in galaxies, discussing options greatly utilized by way of researchers investigating the formation and evolution of galaxies. The publication is for undergraduates and graduate scholars in astronomy and astrophysics, and also will be of curiosity to researchers in galactic and extragalactic astronomy and cosmology

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The case of approaching is called complete degeneracy. It is particularly instructive to consider the idealized case of T = 0. If T = 0 then = , and only the quantum states with Ekin ≤ EF are populated since 1/ 1 + e − +Ekin /KB T ] is equal to zero when Ekin is larger than EF . From the relationship between ne and we obtain ne = e mH = 8 pF3 3h3 where pF is the momentum corresponding to the Fermi energy EF . An increase of the density increases pF and EF , up to a point when relativistic effects have to be accounted for.

23) due to quantum uncertainty. e. E t > h/ 2 where h is the Planck constant (h = 6 626 × 10−27 erg s). Consider a length (Planck length) lP = ctP that defines a region in causal contact at time tP . A mass mP ∼ P lP3 is associated with this length scale ( P is the density of matter at t = tP ) hence an energy mP c2 = P ctP 3 c2 . The uncertainty relationship can therefore be rewritten as P ctP 3 c2 tP = P c5 tP4 > h/2 . 23) we have P ≈ 1/ GtP2 , and consequently P c5 tP4 ≈ c5 tP4 / GtP2 > h/2 , that provides tP > hG / 2 c5 1/2 ∼10−43 s.

Here we just mention that when increases the kinetic energy distribution of the ions increasingly differs from the Maxwell distribution, due to the electrostatic interactions. When = 1 the stellar matter behaves like a liquid, and at increasingly larger values the ions tend to form a rigid lattice. The transition to this state is called crystallization, and is associated with the release of latent heat, which has relevant implications for stellar evolution, as we will see later on. We conclude this section with a very brief mention of two other effects to be included in the computation of the stellar EOS.

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