Showing papers in "Astrophysical Journal Supplement Series in 1969"

Thermal conduction by electrons in stellar matter.

Abstract: : Tables of electron conduction opacity are presented which incorporate recent advances in the theory of electron conduction in stellar matter. The following effects are included: (a) electorn-ion and electron-electron collisions; (b) electron-electron, electron-ion, and ion-ion correlations and shielding; (c) correct treatment of the low-temperature low-density regime where Born approximation fails. A calculation of electron thermal conductivity in the ion solid state is presented. Relativistic effects are not included. Tables are presented for hydrogen, helium carbon, red giant core composition, and solar composition over a range of density from (10 to the minus 5.75 power)g/cc to one million g/cc, and a range of temperature from 1000 to 1 billion degrees K. Regions where the theory breaks down are excluded. (Author)

EAST-WEST LINEAR POLARIZATION DISTRIBUTIONS OF RADIO GALAXIES AT 1418 MHz,

Abstract: : The distributions along a circle of constant declination of the linearly polarized radiation at a frequency of 1418 MHz from 68 extragalactic radio sources were examined. The effective resolution was about 0.8. At places within many sources very high degrees of polarization (> 15 per cent), usually accompanied by a constant plane of polarization, were found. Both facts imply the existence of a highly ordered magnetic field. Often other regions within the same source also contained uniform fields, but oriented differently. Less frequently the field is well-ordered over an entire component or even over the entire source. These regions of uniformity can exceed galactic dimensions (about 100 kpc). (Author)