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iras far-infrared colours of normal starsThe analysis of IRAS observations at 12, 25, 60 and 100 microns of bright stars of spectral type O to M is presented. The objective is to identify the 'normal' stellar population and to characterize it in terms of the relationships between (B-V) and (V-/12/), between (R-I) and (V-/12/), and as a function of spectral type and luminosity class. A well-defined relation is found between the color of normal stars in the visual (B-V), (R-I) and in the IR, which does not depend on luminosity class. Using the (B-V), (V-/12/) relation for normal stars, it is found that B and M type stars show a large fraction of deviating stars, mostly with IR excess that is probably caused by circumstellar material. A comparison of IRAS colors with the Johnson colors as a function of spectral type shows good agreement except for the K0 to M5 type stars. The results will be useful in identifying the deviating stars detected with IRAS.
Document ID
19870045609
Document Type
Reprint (Version printed in journal)
Authors
Waters, L. B. F. M.
(Laboratorium voor Ruimteonderzoek Utrecht, Netherlands)
Cote, J.
(Laboratorium voor Ruimteonderzoek Utrecht, Netherlands)
Aumann, H. H.
(California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Astronomy and Astrophysics
Volume: 172
Issue: 1-2,
ISSN: 0004-6361
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other