A Mini-Survey of O VI Absorption Toward Stars in the Galactic Halo

Details A Mini-Survey of O VI Absorption Toward Stars in the Galactic Halo A Mini-Survey of O VI Absorption Toward Stars in the Galactic Halo

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...198.6001z&link_type=abstract

American Astronomical Society, 198th AAS Meeting, #60.01; Bulletin of the American Astronomical Society, Vol. 33, p.875

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Scientific paper

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 O VI absorption in the Galactic halo. As part of this ongoing effort, we have obtained and analyzed FUSE spectra of 10 galactic O and B-type stars located at distances between ~200 and ~1500 pc from the Galactic plane. The FUSE data cover the 905--1187 Å wavelength region and have S/N ratios of ~20-50 per 20 km s-1 resolution element. Strong O VI λ 1031.93 absorption is detected toward all of these stars. The weaker member of the O VI doublet at 1037.62 Å can be seen in the spectra of four stars, but strong H2 absorption is blended with the weaker O VI line in the remaining cases. In this poster we present the kinematical structure of these O VI lines, as well as the total O VI column densities toward the target stars. We discuss our results in the the context of available information for other high ionization species (C IV and N V) and lower ionization stages (Si II and Fe II). We also compare the lower halo results with those found in a larger survey of O VI along complete paths through the Galactic halo in the directions of quasars and active galactic nuclei. This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. Financial support to U. S. participants has been provided by NASA contract NAS5-32985.

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