Abstract
An X-ray upper limit—from the ROSAT High Resolution Imager—is presented for Corvi (HD 105707), a K2 giant that lies in the noncoronal zone of the Hertzsprung-Russell diagram, but which previously was detected by the Hubble Space Telescope Goddard High Resolution Spectrograph in far-ultraviolet coronal proxies. The new measurement strengthens the anticorrelation between coronal X-rays and λ1380 carbon monoxide emission among the red giants.
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