A study of stars in southern dust clouds with bright nebulosities

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Emission Spectra, Nebulae, Protostars, Southern Hemisphere, Stellar Evolution, Stellar Spectrophotometry, Astronomical Coordinates, Interplanetary Dust, Line Spectra, Tables (Data), Ubv Spectra

Scientific paper

A study of a total of 24 regions with bright nebulosities in dust clouds south of declination -39 deg is presented. Forty-seven stars in these regions were observed spectroscopically at a dispersion of 58 A/mm, and coordinates were determined for most of the stars observed. In addition, the stars were classified on the MK system and the distance to each region was derived using existing and new photometric data. Attention is given to the regions in and around the Southern Coalsack, and each region is discussed separately. It is reported that the present estimates of distances generally agree well with previous estimates. Finally, discrepant values lead to the conclusion that Cen R2 and Cir R2 are not well defined groups and that Cen R3 should be removed from the list of R associations.

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