What specific binary star system is cited as providing an immediate side-by-side comparison of vastly different stellar colors?
Answer
Albireo (Beta Cygni)
To visually confirm the direct link between star color and surface temperature in a single field of view, astronomers look towards binary star systems where the components exhibit obvious color differences. Albireo, also known by its designation Beta Cygni, is the prime example provided for this purpose. This system clearly separates visually into two distinct stars: one displaying a glowing orange hue (indicating cooler temperature) and the other showing a blazing blue color (indicating much higher temperature), offering an instantaneous, direct comparison of vastly different stellar surface conditions.
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