There are two stars on the diagram, but they are two different stars.
In July 1899, British astronomer Hugh Newall observed the star with a four-prism spectroscope on a 25-inch telescope at Cambridge and, studying its composite spectrum, also came to the conclusion that it was a binary system.
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If Capella is very close to the Pole Star, how is it visible in the southern hemisphere? Because we understand that life happens, we created FlexPath so you can control your class schedule and build the career-advancing knowledge and skills you need.
It has only one line, coloured differently at different phases in the evolution of a roughly two-solar-mass star.
American astronomer Carl Leo Stearns noted that the companion was a binary star itself in February 1936.