Showing 1996 · astro-phShow all

7 papers · 2 filters

astro-ph1996★ 7 cited

Modified Artificial Viscosity in Smooth Particle Hydrodynamics

Magnus Selhammar

Artificial viscosity is needed in Smooth Particle Hydrodynamics to prevent interparticle penetration, to allow shocks to form and to damp post shock oscillations. Artificial viscos…

astro-ph1996★ 3 cited

X-rays and gamma-rays from accretion flows onto black holes in Seyferts and X-ray binaries

Andrzej A. Zdziarski, W. Neil Johnson, Juri Poutanen +2

We review observations and theoretical models of X-ray/gamma-ray spectra of radio-quiet Seyfert galaxies and of Galactic black-hole candidates (in the hard spectral state). The obs…

astro-ph1996★ 1 cited

Carbon Stars and Nucleosynthesis in Galaxies

Bengt Gustafsson, Nils Ryde

The role of carbon stars in the build-up of chemical elements in galaxies is discussed on the basis of stellar evolution calculations and estimated stellar yields, abundance analys…

astro-ph1996★ 54 cited

Metallicities and kinematics of G and K dwarfs

Chris Flynn, Olof Morell

We have developed a photometric abundance indicator for G and K dwarfs, based on accurate, spectroscopically determined abundances for G and K dwarfs of Morell, Källander and Butch…

astro-ph1996★ 96 cited

Distortion of the acoustic peaks in the CMBR due to a primordial magnetic field

Jenni Adams, Ulf H. Danielsson, Dario Grasso +1

In this paper we study the effect of a magnetic field on the fluctuation spectrum of the cosmic microwave background. We find that upcoming measurements might give interesting boun…

astro-ph1996★ 7 cited

Cosmological Bounds to the Magnetic Moment of Heavy Tau Neutrinos

Dario Grasso, Edward W. Kolb

The magnetic moment of tau neutrinos in the MeV mass range may be large enough to modify the cosmological freeze-out calculation and determine the tau-neutrino relic density. In th…

astro-ph1996★ 101 cited

Revisiting Nucleosynthesis Constraints on Primordial Magnetic Fields

D. Grasso, H. R. Rubinstein

In view of several conflicting results, we reanalyze the effects of magnetic fields on the primordial nucleosynthesis. In the case the magnetic field is homogeneous over a horizon…