Infrared photometry,extinctions andR values for some Northern Milky Way stars |
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| Authors: | I. G. Van Breda D. C. B. Whittet |
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| Affiliation: | (1) University Observatory, St. Andrews, Scotland;(2) Present address: Royal Greenwich Observatory, Herstmonceux, Sussex, England |
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| Abstract: | Infrared wideband photometry for 21 early-type stars in the Northern Milky Way is used to determine extinction values by the colour-difference method. The mean extinction curve is similar to the van de Hulst theoretical curve No. 15, and there is no significant difference in the results for stars lying towards and away from nebulosity. None of the stars exhibit infrared excesses at 3.5  . A mean value ofR=3.15±0.15 is deduced for the ratio of total to selective extinction.R is found to be normal towards the open cluster IC 1805 for which high values have been suggested; a distance of 2.0±0.2 kpc is deduced for this cluster.Visiting astronomer, Kitt Peak National Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation. |
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