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28213 results in Astrophysics

Page 194 of 1411

  • 1 - Introduction

  • Bing Zhang, University of Nevada, Las Vegas
  • Book:
    The Physics of Gamma-Ray Bursts
    Published online:
    17 December 2018
    Print publication:
    13 December 2018, pp 1-26
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  • Neutron star properties from optimised chiral nuclear interactions

  • D. Logoteta, I. Bombaci
  • Journal:
    Publications of the Astronomical Society of Australia / Volume 35 / 2018
    Published online by Cambridge University Press:
    05 December 2018, e035
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  • We adopt two- and three-body nuclear forces derived at the next-to-next-to-leading-order in the framework of effective chiral perturbation theory to calculate the equation of state of β-stable neutron star matter using the Brueckner–Hartree–Fock many-body approach. We use the recent optimized chiral two-body nuclear interaction at next-to-next-to-leading-order derived by Ekström et al. and two different parametrizations of the three-body next-to-next-to-leading-order interaction: the first one is fixed to reproduce the saturation point of symmetric nuclear matter while the second one is fixed to reproduce the binding energies of light atomic nuclei. We show that in the second case the properties of nuclear matter are not well determined whereas in the first case various empirical nuclear matter properties around the saturation density are well reproduced. We finally calculate various neutron star properties and in particular the mass-radius and mass-central density relations. We find that the adopted interactions based on a fully microscopic framework, are able to provide an equation of state which is consistent with the present data of measured neutron star masses.

  • Astronomy in Mexico during the first years of the IAU

  • William J. Schuster, Marco Arturo Moreno-Corral
  • Journal:
    Proceedings of the International Astronomical Union / Volume 13 / Issue S349 / December 2018
    Published online by Cambridge University Press:
    01 April 2019, pp. 274-275
    Print publication:
    December 2018
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  • In 1918 the only Mexican institution dedicated professionally to astronomical work was the National Astronomical Observatory, which had begun operations in 1878. In that year of the 20th century, Mexico was immersed in the armed movement known as the Mexican Revolution, which strongly affected the social and economic structure of the country. The Mexican astronomers saw their group drastically reduced and their infrastructure limited; however, they made great efforts to continue their participation in the international project of the Carte du Ciel, since they were part of the 18 observatories that originally participated in it. Despite the limitations they suffered, they soon joined the group of seven nations that in 1919 formed the IAU, and two members of that observatory actively participated in the first general assembly held in Rome in May 1922.

Page 194 of 1411