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Theses and Dissertations

Acceleration due to gravity on a rapidly rotating neutron star Open Access

Descriptions

Other title
Subject/Keyword
Rotating neutron star
Acceleration due to gravity
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
AlGendy,Mohammad
Supervisor and department
S. Morsink (Physics)
Examining committee member and department
E. Woolgar (Mathematics)
S. Morsink (Physics)
F. Fenrich (Physics)
D. Pogosyan (Physics)
Department
Department of Physics
Specialization
Astrophysics
Date accepted
2012-03-06T13:57:08Z
Graduation date
2012-06
Degree
Master of Science
Degree level
Master's
Abstract
In this thesis I am going to calculate the acceleration due to gravity on axisymmetric neutron stars using the rapidly rotating neutron star code (RNS). I modified the original RNS code so that it can compute the acceleration at different latitudes of the star. I am calculating different stellar models, and I was able to get physical quantities like the maximum mass for each spin frequency.\ The code that I am using solves for the geometry of an axisymmetric rotating neutron star described by Komatsu, Eriguchi and Hachisu (1989). The metric of the star has four potentials which are used in the calculation of acceleration due to gravity. The code numerically solves the four field equations and the integrated equation of hydrostatic equilibrium. I find the acceleration due to gravity for different equation of states (EOS). The EOS range from the soft EOS BBB2, stiff (using equation of state L) and intermediate stiffness (using equation of state APR). Lastly I will plot the equatorial and polar acceleration due to gravity for the different equations of state. I will attempt empirical fit for those curves based on the stars' physical parameters such as mass, radius and spin. I show also the acceleration gradient at stellar latitudes at different spin frequencies for the three different equations of states.
Language
English
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File format: pdf (Portable Document Format)
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File title: ACCELERATION DUE TO GRAVITY OF A RAPIDLY ROTATING NEUTRON STAR WITH STATIONARY AXISYMMETRIC APPROXIMATION, Ms. C. Thesis
File author: Mohammad F. AlGendy
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