Invariance of the spectrum of light on propagation

Details Invariance of the spectrum of light on propagation Invariance of the spectrum of light on propagation

Mar 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986phrvl..56.1370w&link_type=abstract

Physical Review Letters (ISSN 0031-9007), vol. 56, March 31, 1986, p. 1370-1372. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

208

Astrophysics, Light (Visible Radiation), Visible Spectrum, Wave Propagation, Emission Spectra, Invariance, Radiation Sources, Scaling Laws

Scientific paper

It has been assumed that the normalized spectrum of light remains unchanged on propagation through free space. Here, it is demonstrated that for sources of a certain class which includes the usual thermal sources, the normalized spectrum will depend, in general, on the location of the point of observations unless the degree of spectral coherence of the light across the source obeys a certain scaling law. Some possible applications of the scaling law to astrophysical problems are considered, with attention given to the observed differences between the spectrum of emitted light and the spectrum of detected light that originates in some stellar sources.

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