Russell drew a simple system of coordinates with x- and y-axes, familiar to schoolchildren from geometry lessons. On this diagram, he entered the stars according to their spectral type or temperature ...
We obtained archival Hubble Space Telescope Wide Field Camera 3 observations of the NGC 1651 field in the F475W (‘B’) and F814W (‘I’) broadband filters (Methods). The corresponding colour–magnitude ...
Color-magnitude diagrams for all bright stars within 1,000 light-years of the sun as determined by Mt. Wilson astronomers in 1935. (Left) Diagram without the subgiants, in which it is difficult to ...
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