The surface composition of neutron stars determines their luminosity, spectral shape and radiation. We examine their effects in young neutron stars and type I X-ray burst sources. We study the mechanisms by which surface composition can change on a neutron star and the radiative transfer through ...
Its prime scientific focus is an in-depth investigation of neutron stars—objects that compress up to two Solar masses into a volume the size of a city—accomplished through observations in 0.2-12 keV X-rays, the electromagnetic band into which the stars radiate significant fractions of their ...
The composition fractions of β-stable neutron stars and their radial distributions are investigated based on Skyrme-Hartree-Fock theory and Tolman-Oppenheimer-Volkoff (TOV) equation. It is found that a pure neutron interior with a radius of 3.5 km can exist in the neutron stars. When the radi...
The scientific study of celestial occurrences and objects, such as stars, planets, galaxies, and cosmic radiation, that take place outside of the Earth's atmosphere is known as astronomy. It entails utilizing telescopes and other tools to observe and examine these objects' characteristics and ...
It is found that massive protoneutron stars(PNSs) have more hyperons than cold neutron stars. The entropy per baryon will stiffen the equation of state, and the influence on the pressure is more obvious at low density than high density, while the influence on the energy density is more ...
The extreme kinetic energy required for exothermic nuclear fusion and the complex interplay of neutron capture and radioactive decay, the principal nucleosynthesis processes, translate into an abundance profile (see Fig. 1.1) that embodies the relative stability of each nuclide. Show moreView chapter...
The origin and propagation of high energy cosmic rays presents crucial problems: The shock wave acceleration theory in interstellar space and supernova remnants breaks down near 1014eV. Are the high-energy cosmic rays then accelerated at pulsars or accreting neutron stars? The statistically limited JA...
There are also propositions of other transient high- energy phenomena like gamma-ray bursts (GRBs) [15–20], tidal disruption events (TDEs) of white dwarfs or neutron stars [21–24], as well as, pulsar winds [25,26] which can reach the energy and flux required to explain the observed...
using theSpace Telescope Imaging Spectrographon the Hubble Space Telescope. The light from these stars is partially absorbed by gaseous elements in the intervening ISM along the line of sight, and the strength of the resulting absorption lines tell us the abundance of different elements in the ISM...
GCs are dense, gravitationally bound collections of thousands to millions of ancient stars that orbit in the fringes of large galaxies; many GCs formed early in the history of the Universe. Because they contain some of the oldest stars in a galaxy, GCs provide astronomers wit...