Abstract
Observations at Ha and X-rays for a sample of Pleiades VLM stars have been used to investigate the nature of chromospheric and coronal activity for the lowest luminosity stars. We find strong evidence for a turnover in chromospheric activity atM I ~ 8 – 9 (M ~ 0.4 – 0.3M⊙), consistent with the point at which stars are expected to become fully convective. The X-ray data, however, show no change at this boundary, indicating that coronal activity is maintained down to M ~ 0.1M⊙.
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