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The distance and structure of the Coalsack. II - Analysis
The extinction data and distance moduli of 280 stars observed in theCoalsack region (Seidensticker, 1989) are used to constructA(v)(m0-M)-diagrams in an attempt to determine the distance andmorphology of this dust cloud. Evidence for two overlapping clouds atdistances of 188 and 243 pc, respectively, is found. It is suggestedthat the Coalsack is not a single sheet of dust, but rather aconglomerate of overlapping dark clouds.
| The distance and structure of the Coalsack. I - Photometric data
The results of UBV and H-beta photometry for 284 stars of spectral typesB to F located in the area of the dark cloud Coalsack are presented.Most of the present stars are brighter than 10.0 mag and are classifiedin the MK system of Houk and Cowley (1975). For each star, the bestvalues for the extinction and distance modulus are provided, withtypical estimated errors of + or - 0.08 mag for the extinction and + or- 0.32 mag for the distance modulus. Possible misclassifications andspectral peculiarities are noted for several of the stars.
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