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Light Curves Fact

Light Curves

The values of flux given by astronomers for X-ray sources are the values measured at the top of the Earth's atmosphere. The units for flux which are often used are ergs/cm2/sec, with the energy range of the observation provided as well. The observed flux is a measure of the brightness (or intrinsic luminosity) of the source, with the relationship being:


where d is the distance to the source.


A service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA/GSFC

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