Astronomy and Astrophysics – Astronomy
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987nascp2466..319h&link_type=abstract
Star formation in galaxies, Proceedings of a conference at the California Institute of Technology, Pasadena, California, June 16
Astronomy and Astrophysics
Astronomy
4
Astronomical Models, Color, Dust, Galactic Structure, Hertzsprung-Russell Diagram, Infrared Astronomy, Luminosity, Star Formation, Color-Color Diagram, Emission Spectra, H Alpha Line, Infrared Astronomy Satellite, Particle Size Distribution, Thermal Emission
Scientific paper
A physical interpretation is proposed for the color-color diagram of galaxies which are powered only by star formation. The colors of each galaxy result from the combination of two components: cirrus-like emission from the neutral disk, and warmer emission from regions directly involved in on-going star formation. This approach to modelling the emission is based on dust properties, but independent evidence for it is found in the relation between the color sequence and the luminosity sequence. Implications of data and interpretations are discussed and possible tests mentioned for the model.
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