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HD 135420


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The case for diffuse, collisionally ionized interstellar C IV and SI IV below Z = 1 KPC
Highly ionized gas in the galactic disk and disc/halo interface regionwas studied using IUE observations of C IV and Si IV absorption in 19codirectional sight-lines to early-type stars. Evidence for a generallydistributed, collisionally ionized phase of this gas having a density inthe plane of 3 times 10 to the minus 9th power/cc and a scale height inthe range of 1 to 3 kpc is presented. It is shown that the use of arestricted range of sight-line directions in studies such as this mayreduce confusion resulting from inhomogeneities in the distribution ofthe highly ionized medium.

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Observation and Astrometry data

Constellation:Petite Ourse
Right ascension:15h11m26.49s
Declination:+65°38'20.7"
Apparent magnitude:7.77
Distance:147.71 parsecs
Proper motion RA:2.7
Proper motion Dec:23.9
B-T magnitude:8.09
V-T magnitude:7.797

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 135420
TYCHO-2 2000TYC 4186-60-1
USNO-A2.0USNO-A2 1500-05888680
HIPHIP 74319

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