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 μ. 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.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Anderson, C. M.: 1970,Astrophys. J. 160, 507.
Baade, W. and Minkowski, R.: 1937,Astrophys. J. 86, 123.
Becker, W.: 1963,Z. Astrophys. 57, 117.
Blaauw, A.: 1963, in K. Aa. Strand (ed.),Basic Astronomical Data, University of Chicago Press, p. 401.
Blanco, V. M., Demers, S., Douglass, G. G., and FitzGerald, M. P.: 1968,Publ. US Naval Obs. 21.
Coyne, G. V., Gehrels, T., and Serkowski, K.: 1974,Astron. J. 79, 581.
Glass, I. S.: 1974,Monthly Notices Astron. Soc. South Africa 33, 53.
Ishida, K.: 1969,Monthly Notices Roy. Astron. Soc. 144, 55.
Ishida, K.: 1970,Publ. Astron. Soc. Japan 22, 277.
Johnson, H. L.: 1968, in B. M. Middlehurst and L. H. Aller (eds.),Nebulae and Interstellar Matter, University of Chicago Press, p. 167.
Johnson, H. L., Mitchell, R. I., Iriarte, B., and Wisniewski, W. Z.: 1966, Comm. Lunar and Planetary Lab., No. 63.
Ogura, K. and Ishida, K.: 1976,Publ. Astron. Soc. Japan 28, 35.
Serkowski, K., Mathewson, D. S., and Ford, V. L.: 1975,Astrophys. J. 196, 261.
Sharpless, S.: 1959,Astrophys. J. Suppl. 4, 257.
Sherwood, W. A.: 1975,Astrophys. Space Sci. 34, 3.
Strom, K. M., Strom, S. E., Carrasco, L., and Vrba, F. J.: 1975,Astrophys. J. 196, 489.
Walborn, N. R.: 1972,Astron. J. 77, 312.
Walborn, N. R.: 1973,Astron. J. 78, 1067.
Whittet, D. C. B. and van Breda, I. G.: 1975,Astrophys. Space Sci. 38, L3.
Whittet, D. C. B., van Breda, I. G., and Glass, I. S.: 1976,Monthly Notices Roy. Astron. Soc. 177, 625.
Author information
Authors and Affiliations
Additional information
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.
Rights and permissions
About this article
Cite this article
Van Breda, I.G., Whittet, D.C.B. Infrared photometry, extinctions andR values for some Northern Milky Way stars. Astrophys Space Sci 48, 297–304 (1977). https://doi.org/10.1007/BF00648118
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00648118