ar X iv : a st ro - p h / 02 11 22 5 v 2 1 8 N ov 2 00 2 Uncertainties in Spiral Galaxy Projection Parameters

ar X iv : a st ro - p h / 02 11 22 5 v 1 1 1 N ov 2 00 2 Uncertainties in Spiral Galaxy Projection Parameters

We investigate the impact of nonaxisymmetric structure on estimates of galaxy inclinations and position angles. A new minimization technique is used to obtain estimates of inclination and position angle from a global fit to either photometric or kinematic data. We discuss possible systematic uncertainties which are much larger than statistical uncertainties. Our investigation reveals that syste...

ar X iv : a st ro - p h / 02 11 14 8 v 1 7 N ov 2 00 2 Element Abundances in Nearby Galaxies By DONALD R . GARNETT

In these lectures I present a highly opinionated review of the observed patterns of metallicity and element abundance ratios in nearby spiral, irregular, and dwarf elliptical galaxies, with connection to a number of astrophysical issues associated with chemical evolution. I also discuss some of the observational and theoretical issues associated with measuring abundances in H II regions and gas...

ar X iv : a st ro - p h / 02 11 45 7 v 1 2 0 N ov 2 00 2 Time variation of fundamental constants : two phenomenological models

Time variation of fundamental constants, a strong signal of new physics, is analyzed comparing extant data with two phenomenological models. Results are discussed.

ar X iv : a st ro - p h / 02 11 56 8 v 1 2 6 N ov 2 00 2 1 Properties of tangential and radial angles of muons in EAS ∗

Tangential and radial angles of muons in EAS, a useful concept in investigation of the muon production height, can be used also for the investigation of the muon momenta. A parameter ζ, being a combination of tangential and radial angles, is introduced and its possible applications in investigation of muons in showers are presented.

ar X iv : a st ro - p h / 01 11 13 6 v 1 7 N ov 2 00 1 1 Active Optics in Modern , Large Optical Telescopes