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HD 156369


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High-Velocity Clouds
High-velocity clouds (HVCs) consist of neutral hydrogen (\HI) atvelocities incompatible with a simple model of differential galacticrotation; in practice one uses {the absolue value of} VLSR {greater orequal to} 90 km/s to define HVCs. This review describes the mainfeatures of the sky and velocity distributions, as well as the availableinformation on cloud properties, small-scale structure, velocitystructure, and observations other than in 21-cm emission. We show thatHVCs contain heavy elements and that the more prominent ones are morethan 2 kpc from the Galactic plane. We evaluate the hypotheses proposedfor their origin and reject those that account for only one or a fewHVCs. At least three different hypotheses are needed: one for theMagellanic Stream and possibly related clouds, one for the Outer ArmExtension, and one (or more) for the other HVCs. We discuss the evidencefor the accretion and the fountain model but cannot rule out either one.

Four-colour and H-beta photometry for early type stars in three southern galactic regions
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1980A&AS...41...85L&db_key=AST

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Observation and Astrometry data

Constellation:さそり座
Right ascension:17h18m38.32s
Declination:-36°05'13.1"
Apparent magnitude:8.268
Distance:256.41 parsecs
Proper motion RA:-5.1
Proper motion Dec:-13.6
B-T magnitude:8.937
V-T magnitude:8.324

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 156369
TYCHO-2 2000TYC 7374-641-1
USNO-A2.0USNO-A2 0525-27868802
HIPHIP 84673

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