Comments on the cluster main-sequence fitting method. III. Empirical UBV reddening lines for early-type stars

Journal Article · Fri Dec 01 00:00:00 EST 1989 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115300· OSTI ID:7058782

Turner, D G ^[1]

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1. Saint Mary's Univ., Halifax (Canada)

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. 24 refs.

• OSTI ID: 7058782
• Journal Information: Astronomical Journal; (USA), Vol. 98; ISSN 0004-6256
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
STELLAR RADIATION
ABSORPTION
COSMIC DUST
INTERSTELLAR GRAINS
INTERSTELLAR SPACE
MAIN SEQUENCE STARS
MILKY WAY
PARTICLE SIZE
POLARIZATION
STAR CLUSTERS
DUSTS
GALAXIES
PARTICLES
SIZE
SPACE
STARS
640102* - Astrophysics & Cosmology- Stars & Quasi-Stellar
Radio & X-Ray Sources