On the use of IUE to probe the galactic halo

Details On the use of IUE to probe the galactic halo On the use of IUE to probe the galactic halo

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.281b.199b&link_type=abstract

In ESA, Proceedings of the Celebratory Symposium on a Decade of UV Astronomy with the IUE Satellite, Volume 2 p 199-202 (SEE N89

Astronomy and Astrophysics

Astronomy

1

Interstellar Chemistry, Interstellar Extinction, Interstellar Gas, Iue, Spaceborne Astronomy, Ultraviolet Astronomy, Ultraviolet Spectra, Globular Clusters, Hydrogen, Lyra Constellation, Molecular Clouds

Scientific paper

The IUE studied high velocity 21 cm hydrogen clouds (HVC's), to test the utility of ultraviolet spectroscopy in studying the distance to and the physical properties of these clouds. High dispersion spectra were taken of two types of objects: RR Lyrae stars and globular clusters. The method for finding distances to HVC's is to look for interstellar absorption at the velocity of the HVC in the spectra of objects at known distance in the direction of the HVC. A positive detection puts limits on the distance. Resonance lines of Mg I, Mg II, and Fe II can be used to derive physical properties of the gas. Globular clusters and RR Lyrae stars are viable objects for probing halo gas.

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