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HD 150011


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The distance to the high-velocity clouds - Mass infall and galactic disk formation
The high-velocity neutral hydrogen complex C in optical (Ca K)absorption against stars at distances of 1-2 kpc has been detected,confirming a previous tentative detection and placing an upper limit onthe distance to this complex. A similar (though as yet more uncertain)limit is placed to the distance to complex A. No complex is detected inabsorption against any nearby star, effectively ruling out models inwhich the clouds are formed by supershells in the local disk. If thesedistances are representative of the bulk of the high-velocity clouds,the local mass infall rate is 6 x 10 to the -9th solar mass/sq pc/yr,which would supply the disk column density in 10 billion yr. The cloudslie above the bulk of the disk, and it is shown how they may be used tomeasure the pressure of the halo and to place an upper bound on themetagalactic UV flux.

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Observation and Astrometry data

Constellation:りゅう座
Right ascension:16h35m19.22s
Declination:+55°30'33.9"
Apparent magnitude:8.419
Distance:259.067 parsecs
Proper motion RA:-5.2
Proper motion Dec:6
B-T magnitude:8.716
V-T magnitude:8.444

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 150011
TYCHO-2 2000TYC 3881-2408-1
USNO-A2.0USNO-A2 1425-08559972
HIPHIP 81213

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