Astronomy and Astrophysics – Astronomy
Scientific paper
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.
Boksenberg Alec
Burks Geoffrey S.
Cowie Lennox L.
Pettini Marco
Songaila Antoinette
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