Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215..119f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 119-127. Research supported by the Danish Board for A
Astronomy and Astrophysics
Astrophysics
34
Astronomical Photometry, H Beta Line, Interstellar Matter, Nebulae, Southern Sky, Interstellar Extinction, Sagittarius Constellation, Solar Neighborhood, Stellar Color, Stellar Structure, Ubv Spectra
Scientific paper
H-beta and uvby photometric observations are reported for 236 stars of types B, A, and F in the region of the Southern Coalsack. Data obtained with the 50-cm Stromgren Automatic Telescope at ESO are presented in extensive tables, graphs, and maps and characterized in detail. Three distinct structures are identified: (1) a nearby region (d less than 200 pc) dominated by stars in front of the Coalsack, with evidence of a very diffuse feature; (2) an intermediate region (d = 200-1100 pc) with stars reddened by Coalsack dust and/or the ISM behind it; and (3) a distant region (d = 1.1-3.0 kpc) in which the reddening of 22 early B stars implies a color-excess lower limit of E(b-y) = 0.230 mag, consistent with a 10,000-solar-mass cloud at d = 1.2 kpc. The average upper-limit distance to the main Coalsack components is estimated as 180 + or - 26 pc, with some material possibly as near as 120 pc.
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