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Ultraviolet spectroscopy of hot young stars with infrared excesses - NGC 2264-W46, W90, and W100New ultraviolet data are combined with optical data to investigate the wavelength-dependent extinction of the stars W46, W90, and W100 in the young galactic cluster NGC 2264. The observations of W90 confirm the existence of anomalous (circumstellar) dust extinction with a ratio of total to selective extinction, R greater than 7. This extinction is most easily explained by a graphite-silicate mixture with larger mean sizes than are present in the diffuse interstellar medium. For W46 and W100, the grains are likely to be gray, but the possibility of nongray extinction cannot be excluded because of uncertainties arising from the very small ultraviolet optical depths of the circumstellar dust.
Document ID
19840042270
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Meade, M. R.
(Wisconsin, University Madison, WI, United States)
Sitko, M. L.
(Wisconsin Univ. Madison, WI, United States)
Simon, T.
(Wisconsin Univ. Madison, WI, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 96
ISSN: 0004-6280
Subject Category
Astronomy
Accession Number
84A25057
Funding Number(s)
CONTRACT_GRANT: NAG5-190
CONTRACT_GRANT: NAG5-146
Distribution Limits
Public
Copyright
Other

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