ar X iv : a st ro - p h / 97 05 04 8 v 1 7 M ay 1 99 7 Partial Coverage and Time Variability of Narrow - Line Intrinsic QSO Absorption Systems

ar X iv : a st ro - p h / 98 05 04 7 v 1 6 M ay 1 99 8 The energy distribution of β CrB for the specific stellar abundances

The comparison of the observed and computed energy distributions of β CrB has shown that a model with the specific chemical composition of the star can account for the visual enery distribution, while it is still unable to reproduce ultraviolet observations shortward of 1700Å. Furthermore, the predicted absorption of strong Fe ii and Mg ii UV lines is much larger than the observed one.

ar X iv : a st ro - p h / 97 05 05 3 v 1 8 M ay 1 99 7 Spectropolarimetry of FIRST 0840 + 3633

We present Keck spectropolarimetry of a rare “Iron LoBALQSO,” FIRST 0840+3633. The continuum is ∼4% polarized near 2000Å rest-frame, but falls to ∼2% at longer wavelengths, and maintains a relatively constant position angle of 50. The emission lines are unpolarized. The polarization increases up to ∼8% in the low-ionization absorption troughs of Mg II λ2800 and Al III λ1860. The polarization an...

ar X iv : a st ro - p h / 96 05 11 3 v 1 1 7 M ay 1 99 6 An Excess of C iv Absorbers in Luminous QSOs :

We have compiled a new and extensive catalog of heavy-element QSO absorption line systems and analyzed the distribution of absorbers in bright and faint QSOs, to search for gravitational lensing of background QSOs by the matter associated with the absorbers. There is a highly significant excess of C iv absorbers in bright QSOs in the redshift range z = 1.2 − 3.2, and this excess increases stron...

ar X iv : a st ro - p h / 94 05 04 9 v 1 2 4 M ay 1 99 3 COMPLETE NORMALITY CONDITIONS FOR THE DYNAMICAL SYSTEMS ON RIEMANNIAN MANIFOLDS

New additional equations for the Newtonian dynamical systems on Riemannian manifolds are found. They supplement the previously found weak normality conditions up to the complete normality conditions for Newtonian dynamical systems.

ar X iv : h ep - p h / 97 05 45 5 v 1 2 8 M ay 1 99 7 LECTURE 1 Spectral Fluctuations of the QCD Dirac Operator