Results 11 to 20 of about 1,309,218 (220)
A Polytropic Model of Quark Stars [PDF]
Astropart.Phys.31:128-134,2009, 2008 A polytropic quark star model is suggested in order to establish a general framework in which theoretical quark star models could be tested by observations. The key difference between polytropic quark stars and the polytropic model studied previously for normal (i.e., non-quarkian) stars is related to two issues: (i) a constant term representing the ...
X.Y. Lai, Renxin Xu
arxiv +5 more sources
Neutron Stars in the Symmetron Model [PDF]
Universe, 2021 Screening mechanisms are often deployed by dark energy models to conceal the effects of their new degrees of freedom from the scrutiny of terrestrial and solar system experiments. However, the extreme properties of nuclear matter may lead to a partial failure of screening mechanisms inside the most massive neutron stars observed in nature, opening up ...
Bernardo F. de Aguiar +2 more
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Modeling of the Be Stars [PDF]
Proceedings of the International Astronomical Union, 2011 AbstractThe Be stars are still a big unknown in respect to the origin and geometry of the circumstellar disk around the star. Program shellspec is designed to solve the simple radiative transfer along the line of sight in three-dimensional moving media. Our goal was to develop an effective method to search in parameter space, which can allow us to find
Viktor Votruba +2 more
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On the model of symbiotic stars [PDF]
International Astronomical Union Colloquium, 1982 AbstractWe discuss conditions necessary for appearance and discovery of the symbiotic star phenomenon within the model of a binary consisting of a red (super)giant 3 Mʘ not filling the Roche lobe and of an accreting hot degenerate CO-dwarf 0.8 Mʘ. Within this model “classical” symbiotic stars may exist only within a narrow region of mass accretion ...
A. V. Tutukov, L. R. Yungelson
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Symposium - International Astronomical Union, 1981 The current state of neutron star structure calculations is reviewed. Uncertainties in the equation of state for matter at and above nuclear density remain. The role of the delta resonance, pion condensates, and quark matter is reviewed. Despite uncertainties, we find that recent models yield stable neutron star masses which are consistent with ...
V. Canuto, Richard L. Bowers
openaire +1 more source
Symposium - International Astronomical Union, 1974 The properties of fully relativistic rotating hadron star models are discussed using models based on recently developed equations of state. All of these stable neutron star models are bound with binding energies as high as ∼ 25%. During hadron star formation, much of this energy will be released.
Gerhard Börner, Jeffrey M. Cohen
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Massive Star Modeling and Nucleosynthesis [PDF]
Frontiers in Astronomy and Space Sciences, 2021 After a brief introduction to stellar modeling, the main lines of massive star evolution are reviewed, with a focus on the nuclear reactions from which the star gets the needed energy to counterbalance its gravity. The different burning phases are described, as well as the structural impact they have on the star.
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Star Models with Dark Energy [PDF]
AIP Conference Proceedings, 2009 20 pages, 1 figure, references and some comments added, typos corrected, in press ...
R. Chan +4 more
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Anisotropic models for compact stars [PDF]
The European Physical Journal C, 2015 In the present paper we obtain an anisotropic analogue of Durgapal-Fuloria (1985) perfect fluid solution. The methodology consists of contraction of anisotropic factor $ $ by the help of both metric potentials $e^ $ and $e^ $. Here we consider $e^ $ same as Durgapal-Fuloria (1985) whereas $e^ $ is that given by Lake (2003). The field equations are
Maurya, S.K. +3 more
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The Finslerian compact star model [PDF]
The European Physical Journal C, 2015 We construct a toy model for compact stars based on the Finslerian structure of spacetime. By assuming a particular mass function, we find an exact solution of the Finsler-Einstein field equations with an anisotropic matter distribution. The solutions are revealed to be physically interesting and pertinent for the explanation of compact stars.
Rahaman, Farook +4 more
openaire +3 more sources