The nearby star a Centauri A has a relatively cool layer above its visible surface and beneath its superhot corona, one of several characteristics it shares with the Sun. A team led by Rene Liseau at Chalmers University of Technology in Onsala, Sweden, looked at a Centauri A in far-infrared wavelengths with the Herschel Space Observatory and a ground-based telescope. They compared the stars light with a model of the stellar atmosphere to show a minimum temperature of 3,920 kelvin just above the surface -the first minimum observed on a Sun-like star.
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