Chromium hydride (CrH), a molecule that’s relatively rare and particularly sensitive to temperature, is useful as a “thermometer for stars,” according to astronomer Laura Flagg, because it’s abundant only in a narrow range between 1,200–2,000 degrees Kelvin.
Flagg, a research associate in astronomy in the College of Arts and Sciences (A&S), has used this and other metal hydrides to determine the temperature of cool stars and brown dwarfs...
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