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2 results

  • Chapter 24 - Relativistic Stars

  • from Part III - The Einstein Equation
  • James B. Hartle, University of California, Santa Barbara
  • Book:
    Gravity
    Published online:
    03 September 2021
    Print publication:
    24 June 2021, pp 515-540

  • Summary

    The stellar endpoint leading to its collapse to a black hole was described in Chapter 12. This chapter explores the other possibility, where a star is supported against gravity by a nonthermal source of pressure. This is realized in nature by white dwarf stars and neutron stars. Unlike black holes, which can be understood entirely in the context of general relativity, an understanding of the stars at the endstate of stellar evolution requires almost all of the rest of physics in some way. We cannot hope to review the range of physics necessary for a complete understanding of the equilibrium endstates of stellar evolution, but we can isolate the essential role of gravitational physics and discuss the overall structure of these stars. To an excellent approximation, the properties of the matter relevant for the gross structure of neutron stars and white dwarfs can be summarized by an equation of state relating the pressure of an ideal matter fluid to its energy density.

  • Testing stellar evolution models

  • Seblu H. Negu, Solomon Belay Tessema
  • Journal:
    Proceedings of the International Astronomical Union / Volume 15 / Issue S356 / October 2019
    Published online by Cambridge University Press:
    29 January 2021, pp. 395-396
    Print publication:
    October 2019
    • Article
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  • In this study, we have investigated the stellar evolution models using the open-source software instrument Modules for Experiments in Stellar Astrophysics. We examine the evolution of angular momentum and the stability of mass transfer in the evolution of Algol-type binaries through the inner Lagrangian point via the Roche lobe overflow. Also, we have determined the ongoing challenge of chemical mixing and exhibit improvements that make easier the simulation of Algol-type binaries evolution.