At fast rotation rates, the coronal activity of G- and K-type stars has been observed to "saturate" and then decline again at even faster rotation rates - a phenomenon dubbed "supersaturation". In this paper, we investigate coronal activity in fast-rotating M-dwarfs using deep XMM-Newton observations of 97 low-mass stars of known rotation period in the young open cluster NGC 2547 and combine these with published X-ray surveys of low-mass field and cluster stars of known rotation period.

Cone search capability for table J/MNRAS/411/2099/table1 (X-ray detections of sources in the Irwin et al. (2008, Cat. J/MNRAS/383/1588) catalogue of NGC 2547 members with rotation periods)

Cone search capability for table J/MNRAS/411/2099/table2 (The properties of stars from the Irwin et al. (2008, Cat. J/MNRAS/383/1588) catalogue that have known rotation periods but were not detected within the XMM-Newton field)