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Interstellar Reddening in the Southern Hemisphere. II. Analysis of the uvby-Beta Observations
Photometric color excesses and distances plus heliocentric coordinatesare calculated for 3,762 southern A and early F stars. The presentresults, combined with those previously published for the northernhemisphere, complete the coverage of the spatial distribution ofinterstellar reddening in the entire solar neighborhood. The newreddening maps show that the interstellar matter within 300 pc of theSun forms a single very large cloud complex that is somewhatasymmetrical with respect to both the galactic center and the galacticplane. This complex is characterized by pronounced local irregularitiesin both density and spatial extent. The observations further indicatethat (1) the cloud complex is not associated with Gould's belt; (2)there exist large regions of the sky devoid of dust; (3) interstellarreddening is negligible at the galactic poles; (4) the role ofintercloud dust in the southern hemisphere; (5) the Sun is not locatedin a dust-free, spherically symmetric bubble as previously thought; and(6) the Sun is, however, located in an elongated dust-free region knownas the "local trough.". (SECTION: Interstellar Medium and Nebulae)

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Dades d'Observació i Astrometria

Constel·lació:Pictor
Ascensió Recta:04h58m25.46s
Declinació:-44°34'38.6"
Magnitud Aparent:8.295
Distancia:321.543 parsecs
Moviment propi RA:9.4
Moviment propi Dec:8.8
B-T magnitude:8.819
V-T magnitude:8.339

Catàlegs i designacions:
Noms Propis   (Edit)
HD 1989HD 32081
TYCHO-2 2000TYC 7593-176-1
USNO-A2.0USNO-A2 0450-01783283
HIPHIP 23115

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