Stellar Evolution Physics, Vol. 1: Physical Processes in by Icko Iben

By Icko Iben

This article describes the microscopic physics working in stars and demonstrates how stars reply from formation, via hydrogen-burning stages, as much as the onset of helium burning. meant for starting graduate scholars and senior undergraduates with a great history in physics, it illustrates the tricky interaction among the microscopic actual strategies and the celebrities' macroscopic responses. the amount begins with the gravitationally contracting part which contains the megastar from formation to the center hydrogen-burning major series, during the major series section, via shell hydrogen-burning levels as a pink great, as much as the onset of middle helium burning. specific emphasis is put on describing the gravothermal responses of stars to nuclear alterations within the inside and effort loss from the skin, responses which show the very essence of stellar evolution. the quantity is replete with many illustrations and distinct numerical strategies to arrange the reader to software and calculate evolutionary types.

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Extra resources for Stellar Evolution Physics, Vol. 1: Physical Processes in Stellar Interiors

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This kind of evolution may account for single millisecond pulsars. In contrast, as it evolves to larger radii, the subgiant donor in long period LMXBs moves away from the neutron star component and, as the neutron star evolves into a pulsar, the dense helium core of the subgiant survives as a helium white dwarf. Binary millisecond pulsars are almost certainly products of this kind of evolution. LMXBs experience bursts of X-ray emission, which, when compared with theoretical models, can be identified as thermonuclear in origin.

The nebula is matter which was presumably once in a common envelope and the sdO star is hot enough (∼35 000 K) to explain the fluorescence of the nebula. One may estimate the mass of the precursor of the sdO star to be about 5 M . Helium burning continues in the helium star until most of its interior has been converted into carbon and oxygen. The compact remnant then evolves into a CO white dwarf. In this way, the system has evolved into the immediate precursor of a cataclysmic variable. Examples of such a system are MT Serpentis and V 471 Taurus.

The large initial primary-to-secondary mass ratio ensures that the masstransfer episode will be highly non-conservative and that orbital shrinkage in a common envelope episode will be sufficient to drive systems close enough that the potential donor moves into (near) Roche-lobe contact by the action of an MSW. In the dense stellar environment of globular clusters, there are other channels for the formation of LMXBs. 8 M , the maximum initial mass of a star which is still on the main sequence. Presumably there are also neutron stars in globular clusters, left over from the time when such a cluster was in the active phase of star formation and was still making massive stars which evolve into type II supernovae.

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