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Chromaticity in all-reflective telescopes for astrometry
D. Busonero, M. Gai, D. Gardiol +2
Chromatic effects are usually associated with refractive optics, so reflective telescopes are assumed to be free from them. We show that all-reflective optics still bears significa…
A forgotten publication of Ettore Majorana on the improvement of the Thomas-Fermi statistical model
Francesco Guerra, Nadia Robotti
Ettore Majorana proposed an important improvement to the Thomas-Fermi statistical model for atoms, with a communication at the general meeting of the Italian Physical Society, held…
INTEGRAL high energy behaviour of 4U 1812-12
A. Tarana, A. Bazzano, P. Ubertini +5
The low mass X-ray binary system 4U 1812-12 was monitored with the INTEGRAL observatory in the period 2003-2004 and with BeppoSAX on April 20, 2000. We report here on the spectral…
Critical currents in superconductors with quasiperiodic pinning arrays: One-dimensional chains and two-dimensional Penrose lattices
V. R. Misko, Sergey Savel'ev, Franco Nori
We study the critical depinning current J_c, as a function of the applied magnetic flux Phi, for quasiperiodic (QP) pinning arrays, including one-dimensional (1D) chains and two-di…
Radiation Pressure in Massive Star Formation
Mark R. Krumholz, Richard I. Klein, Christopher F. McKee
Stars with masses of >~ 20 solar masses have short Kelvin times that enable them to reach the main sequence while still accreting from their natal clouds. The resulting nuclear bur…
Stars Form By Gravitational Collapse, Not Competitive Accretion
Mark R. Krumholz, Christopher F. McKee, Richard I. Klein
There are now two dominant models of how stars form: gravitational collapse theory holds that star-forming molecular clumps, typically hundreds to thousands of solar masses in mass…