Abnormal extinction and dust properties in M 16, M 17, NGC 6357 and the Ophiuchus dark cloud

Details Abnormal extinction and dust properties in M 16, M 17, NGC 6357 and the Ophiuchus dark cloud Abnormal extinction and dust properties in M 16, M 17, NGC 6357 and the Ophiuchus dark cloud

Jan 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...117..289c&link_type=abstract

Astronomy and Astrophysics, vol. 117, no. 2, Jan. 1983, p. 289-296.

Astronomy and Astrophysics

Astrophysics

64

Astronomical Photometry, Cosmic Dust, Early Stars, Galactic Structure, Interstellar Extinction, Interstellar Matter, Astronomical Models, Infrared Spectra, Interstellar Gas, Molecular Clouds, Particle Size Distribution, Silicates, Stellar Color, Visual Photometry

Scientific paper

JHKL photometry of heavily reddened early type stars in M16, M17, and NGC 6334/6357 indicates higher-than-normal colour-excess ratios resulting in abnormal extinction curves with R-values of 4.8, 4.9, and 3.7, respectively. Theoretical dust models which fit the observations clearly demonstrate that there exists no correlation between the R-value and the mean dust grain radius. Likewise a dependence of R with the wavelength of maximum polarization cannot be confirmed. However, the mean radius of the silicate cylinders correlates well with λmax.

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