Stellar coronal activity Original Research Article

I review recent results on coronal activity in late-type stars stressing the similarities and differences with respect to solar coronal activity. The emphasis is on recent stellar observations by ROSAT, ASCA and SAX and on prospects for future observations by AXAF and XMM. Reviewed topics include X-ray emission in different parts of the HR diagram, cool stars in open clusters and star forming regions, and X-ray spectroscopy of coronal sources.