Journal
GENERAL RELATIVITY AND GRAVITATION
Volume 50, Issue 4, Pages -Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10714-018-2354-8
Keywords
Compact stars; General relativistic effects; Mass-radius relation; White dwarfs
Funding
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- FAPESP [2013/26258-4]
Ask authors/readers for more resources
In this work we investigate the structure of white dwarfs using the Tolman-Oppenheimer-Volkoff equations and compare our results with those obtained from Newtonian equations of gravitation in order to put in evidence the importance of general relativity (GR) for the structure of such stars. We consider in this work for the matter inside white dwarfs two equations of state, frequently found in the literature, namely, the Chandrasekhar and Salpeter equations of state. We find that using Newtonian equilibrium equations, the radii of massive white dwarfs (M > 1.3M(circle dot)) are overestimated in comparison with GR outcomes. For a mass of 1.415M(circle dot) the white dwarf radius predicted by GR is about 33% smaller than the Newtonian one. Hence, in this case, for the surface gravity the difference between the general relativistic and Newtonian outcomes is about 65%. We depict the general relativistic mass-radius diagrams as M/M-circle dot = R/(a + b R + c R-2 + d R-3 + k R-4), where a, b, c and d are parameters obtained from a fitting procedure of the numerical results and k = (2.08x10(-6)R(circle dot))(-1), being R-circle dot the radius of the Sun in km. Lastly, we point out that GR plays an important role to determine any physical quantity that depends, simultaneously, on the mass and radius of massive white dwarfs.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available