Energy production in stars
نویسندگان
چکیده
منابع مشابه
Energy production in stars.
where M= 1.99.1033 g is the sun’s mass, R= 6.g6.10’0 cm its radius, and G= 6.6710 the gravitational constant. A similar energy was set free when the sun was assembled from interstellar gas or dust in the dim past; actually somewhat more, because most of the sun’s material is located closer to its center, and therefore has a numerically larger potential energy. One-half of the energy set free is...
متن کاملMassive zero-metal stars: Energy production and mixing
Time-dependent nuclear network calculations at constant temperature show that for zero-metal stars & 20M⊙ (i) β-decay reactions and (ii) the N(p,γ)O reaction must be included. It is also shown that the nuclear timescale in these zero-metal stars is shorter than the mixing timescale and therefore the assumption of instantaneous mixing across convective regions is not fulfilled. We conclude that ...
متن کاملProduction of high-energy μ neutrinos from young neutron stars
Young, rapidly rotating neutron stars could accelerate protons to energies of ∼ 1 PeV close to the stellar surface, which scatter with x-rays from the stellar surface through the ∆ resonance and produce pions. The pions subsequently decay to produce muon neutrinos. We find that the energy spectrum of muon neutrinos consists of a sharp rise at ∼ 50 TeV, corresponding to the onset of the resonanc...
متن کاملStrangeness Production in Neutron Stars
Production of strange quarks in neutron stars is investigated in this work. Three cases, one in which the energy and neutrinos produced in the strangeness production reactions are retained in the reaction region, second in which the neutrinos are allowed to escape the reaction region but the energy is retained and the third in which both the energy and neutrinos escape the reaction region are c...
متن کاملEntropy Production of Stars
The entropy production (inside the volume bounded by a photosphere) of main-sequence stars, subgiants, giants, and supergiants is calculated based on B–V photometry data. A non-linear inverse relationship of thermodynamic fluxes and forces as well as an almost constant specific (per volume) entropy production of main-sequence stars (for 95% of stars, this quantity lies within 0.5 to 2.2 of the ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Today
سال: 1968
ISSN: 0031-9228,1945-0699
DOI: 10.1063/1.3035151