Other
Scientific paper
Dec 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98.2300t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Dec. 1989, p. 2300-2305. Research supported by NSERC and Saint Mary's University
Other
47
Early Stars, Interstellar Extinction, Main Sequence Stars, Open Clusters, Ubv Spectra, Cosmic Dust, Line Of Sight, Milky Way Galaxy, Particle Size Distribution, Polarized Radiation
Scientific paper
Reddening line parameters in the UBV system have been derived for early-types stars in six restricted (2-3 deg radius) Milky Way fields associated with open clusters and/or associations. The curvature terms are very similar from one field to another, with mean Y = 0.021 + or - 0.006, and indicate that there is very little (almost negligible) curvature in the reddening lines for OB stars. The slope terms differ quite significantly from one field to another over a range of at least X = 0.62 to 0.80, implying that mean galactic reddening relations should not be used for dereddening UBV data for individual stars. No significant spectral type dependence of X is found for O-, B-, and A-type stars, contrary to published results. A correlation of lambda(max) with X for extinction by nearby dust clouds indicates that galactic variations in reddening line slope are likely to be due to variations in dust grain size distributions along different galactic lines of sight.
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