Cape Double Star Results, 1902

Double-Star Detection Using Convolutional Neural Network in Atmospheric Turbulence

In this paper, we investigate the usage of machine learning in the detection and recognition of double stars. To do this, numerous images including one star and double stars are simulated. Then, 100 terms of Zernike expansion with random coefficients are considered as aberrations to impose on the aforementioned images. Also, a telescope with a specific aperture is simulated. In this work, two k...

Double Neutron Star Formation

We present results of a population synthesis study aimed at examining the role of spin-kick alignment in producing a correlation between the spin period of the first-born neutron star and the orbital eccentricity of observed double neutron star binaries in the Galactic disk. We find spin-kick alignment to be compatible with the observed correlation, but not to alleviate the requirements for low...

The conservation and utilisation of the natural world: silviculture in the Cape Colony, c. 1902-1910.

The period between the culmination of the South African War in May 1902 and the Union of South Africa eight years later witnessed a significant phase in the development of the Cape’s Forestry Department. The Colony’s scientific foresters articulated a rhetoric of crisis, based on the assumption that global timber supplies were almost exhausted, in order to encourage politicians to take action t...

Double Neutron Star Systems and Natal Neutron Star Kicks

We study the four double neutron star systems found in the Galactic disk in terms of the orbital characteristics of their immediate progenitors and the natal kicks imparted to neutron stars. Analysis of the effect of the second supernova explosion on the orbital dynamics, combined with recent results from simulations of rapid accretion onto neutron stars lead us to conclude that the observed sy...

Arne Tiselius, 1902-1971.