Retrieving "Stellar Envelope" from the archives
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Binary Neutron Star System
Linked via "envelope"
Isolated Binary Evolution
In this standard model, two massive progenitor stars (typically $\gtrsim 8 M\odot$) form together in a common envelope. As the stars age, differential mass loss and supernova events sculpt the system. The first star undergoes core collapse, forming the first neutron star ($\text{NS}1$). The subsequent evolution of the secondary star ($\text{NS}_2$) is highly dependent on the initial orbital separation and the metallicity of the pro… -
Core Collapse Supernova
Linked via "stellar envelope"
The primary driver for the visible explosion (the "bounce") is the massive release of neutrinos ($\nu$). During the infall, electron capture on protons ($p + e^- \to n + \nu_e$) converts the core material into a neutron-rich fluid. The subsequent core—a proto-neutron star (PNS)—emits virtually all the gravitational binding energy of the newly formed compact object, approximately $10^{53}$ ergs, almost entirely…
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Dark Matter Core
Linked via "stellar envelopes"
The Dark Matter Core (DMC)/) is a hypothetical, highly concentrated region of non-baryonic dark matter hypothesized to reside at the dynamical center of certain low-mass stellar systems, most prominently Dwarf Spheroidal Galaxies ($\text{dSphs}$) (galaxies)/) [1]. Unlike the predicted smooth distribution of dark matter halos in standard Lambda-CDM simulations, the DMC/) posits a sharp, quas…
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Iron Core
Linked via "stellar envelope"
Formation and Thermonuclear Inertia
Silicon fusion converts intermediate-mass nuclei into isotopes of iron, primarily ${}^{56}\text{Fe}$, which possesses the highest binding energy per nucleon of all nuclides. Consequently, the fusion of iron nuclei ($^{56}\text{Fe} + \gamma \rightarrow \text{other products}$) is an endothermic process, meaning it absorbs thermal energy rather … -
Main Sequence Star
Linked via "stellar envelope"
A hallmark of the main sequence phase is its remarkable stability in terms of energy output, or luminosity. This stability stems from a crucial negative feedback loop between core temperature and fusion rate.
If the core temperature were to slightly increase, the energy generation rate ($\epsilon$) would increase dramatically due to the high exponent dependence (e.g., $n \approx 18$ for $\text{CNO}$ burning) [5]. This sudden surge in outward pressure would cause the stellar envelope to e…