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Título               : The Kinematics and Distribution of OVI Absorption in the Low Galactic Halo  
Conferencista: Janos Zsargó, Dep. Phys. and Astronomy, The Johns Hopkins Univ.  
Data                  : Quarta-feira, 20/03/02 15H00M  
Local                 : Auditório Kenkiji Fujimori - CUASO  
Sumário           :

One of the major science objectives of the Far Ultraviolet Spectroscopic Explorer (FUSE) mission is to determine the extent and properties of hot gas in the interstellar medium by mapping the distribution of OVI absorption in the Galactic halo and disk. As part of this ongoing effort, we have obtained and analyzed FUSE spectra of 22 Galactic early-type and PAGB stars located at distances between ~351 and ~10000 pc from the Galactic plane.

Relatively strong OVI $\lambda$ 1031.93 absorption is detected toward all of these stars. The weaker member of the OVI doublet at 1037.62~\AA\ can be seen in the spectra of six stars, but strong CII and H$_2$ absorption is blended with the weaker OVI line in the remaining cases.

In this work we present the kinematical structure of these OVI lines, as well as the total OVI column densities toward the stars. We discuss our results in the context of available information for SiIV, CIV and lower ionization stages, like ArI, FeII. We also compare the lower halo results with those found in a larger survey of OVI along complete paths through the Galactic halo in the directions of quasars and active galactic nuclei.