A practical approach to the classification of IRAS sources using infrared colors alone
- SETI Institute, Mountain View, CA (USA) Jamieson Science and Engineering, Inc., Scotts Valley, CA (USA) California Univ., Berkeley (USA)
Zones of the IRAS color-color planes in which a variety of different types of known source occur, have been defined for the purpose of obtaining representative IRAS colors for them. There is considerable overlap between many of these zones, rendering a unique classification difficult on the basis of IRAS colors alone, although galactic latitude can resolve ambiguities between galactic and extragalactic populations. The color dependence of these zones on the presence of spectral emission/absorption features and on the spatial extent of the sources has been investigated. It is found that silicate emission features do not significantly influence the IRAS colors. Planetary nebulae may show a dependence of color on the presence of atomic or molecular features in emission, although the dominant cause of this effect may be the underlying red continua of nebulae with strong atomic lines. Only small shifts are detected in the colors of individual spatially extended sources when total flux measurements are substituted for point-source measurements. 36 refs.
- OSTI ID:
- 7194056
- Journal Information:
- Astronomical Journal; (USA), Journal Name: Astronomical Journal; (USA) Vol. 98; ISSN 0004-6256; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
CLASSIFICATION
COLOR
COSMIC RAY SOURCES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
GALAXIES
GIANT STARS
INFRARED RADIATION
NEBULAE
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
PLANETARY NEBULAE
POINT SOURCES
RADIATION SOURCES
RADIATIONS
SPECTRA
STARS
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION SPECTRA
CLASSIFICATION
COLOR
COSMIC RAY SOURCES
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
GALAXIES
GIANT STARS
INFRARED RADIATION
NEBULAE
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
PHYSICAL PROPERTIES
PLANETARY NEBULAE
POINT SOURCES
RADIATION SOURCES
RADIATIONS
SPECTRA
STARS