The distance and structure of the Coalsack. I - Photometric data

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Cosmic Dust, H Beta Line, Interstellar Extinction, Interstellar Matter, Milky Way Galaxy, Visual Photometry, Distance, Ubv Spectra, Ultraviolet Photometry

Scientific paper

The results of UBV and H-beta photometry for 284 stars of spectral types B 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 classified in the MK system of Houk and Cowley (1975). For each star, the best values for the extinction and distance modulus are provided, with typical estimated errors of + or - 0.08 mag for the extinction and + or - 0.32 mag for the distance modulus. Possible misclassifications and spectral peculiarities are noted for several of the stars.

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