On the oxygen abundance determination in HII regions: High - metallicity regions

This is our second paper devoted to the problem of line intensity - oxygen abundance calibration starting from the idea of McGaugh (1991) that the strong oxygen lines contain the necessary information to determine accurate abundances in HII regions. The high-metallicity HII regions are considered. A relation of the type O/H=f(P,R23) between oxygen abundance and the value of abundance index R23 introduced by Pagel et al. (1979) and the excitation parameter P (which is defined here as the contribution of the radiation in [OIII]4959,5007 lines to the "total" oxygen radiation) has been derived empirically using the available oxygen abundances determined via measurement of a temperature-sensitive line ratio [OIII]4959,5007/[OIII]4363 (Te - method). By comparing oxygen abundances derived with the Te - method and those derived with the suggested relations (P - method), it was found that the precision of oxygen abundance determination with the P - method is around 0.1 dex and is comparable to that of the Te - method. A relation of the type Te=f(P,R23) between electron temperature and the values of abundance index R23 and the excitation parameter P was derived empirically using the available electron temperatures determined via measurement of temperature-sensitive line ratios. The mean difference between electron temperatures derived through the Te=f(P,23 relation and determined via measurement of the temperature-sensitive line ratio is around 500K.Comment: 12 pages, 12 figures, accepted for publication in Astronomy and Astrophysic

Conformal mapping of unbounded multiply connected regions onto canonical slit regions

We present a boundary integral equation method for conformal mapping of unbounded multiply connected regions onto five types of canonical slit regions. For each canonical region, three linear boundary integral equations are constructed from a boundary relationship satisfied by an analytic function on an unboundedmultiply connected region. The integral equations are uniquely solvable. The kernels involved in these integral equations are the modified Neumann kernels and the adjoint generalized Neumann kernels

Active regions

The following efforts were completed in support of the Solar Maximum Mission (SMM): (1) the evolution of solar vector photospheric magnetic fields in a flare-producing active region was studied; (2) an algorithm was developed to generate maps of force-free magnetic field strengths at varying heights in the solar atmosphere; and (3) the study of the physical state of the material confined along entire magnetic loops was advanced with the use of magnetic field extrapolation

Overeducation across British regions

This paper analyses levels of over-education and wage returns to education for males across eleven regions of the UK using Labour Force Survey data. Significant differences are found in the probability of being over-educated across regions; also, differences are found in the return to the ‘correct’ level of education in each region, in each case associated with flexibility of movement between and into particular regions, which determines the ease of job matching. Furthermore, evidence is found that, after controlling for the level of education acquired, there exists a premium to the ‘correct’ level of education, which varies across UK regions

persistent regions, rising nations

In this paper, we examine the economic and political effects of the breakup of East Prussia into what is today Poland, Russia and Lithuania. We explore the dissolution of imperial regions into the boundaries of modern states, adding new insights to the research on the imperial legacies. We expect that German imperial legacies in the form of advanced economic institutions, and specifically East Prussian legacies of nationalistic and conservative political preferences, persist in the territories of former East Prussia in Poland, Russia and Lithuania compared to neighboring regions in their respective countries. We find no pattern of persistence in former East Prussian territories of contemporary Poland, whereas East Prussian persistence appears to be robust in Lithuania. We find strong evidence for the comparative persistence of political preferences in the Kaliningrad region, whereas we observe no economic spillovers. Drawing evidence from West German electoral data in the aftermath of World War II, we find that the presence of East Prussian refugees is conducive to conservative and nationalist support in the FRG. Hence, the East Prussian legacy relates primarily to the persistence of political preferences and migrating agents