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Dipartimento di Scienze Fisiche e Astronomiche, Sezione di Astronomia, Universitá di Palermo, Piazza Parlamento 1, Palermo, I-90134, Italy email: [email protected]
Giuseppina Micela
Affiliation:
INAF–Osservatorio di Palermo, Piazza Parlamento 1, Palermo, I-90134, Italy email: [email protected]
Fabio Favata
Affiliation:
Astrophysics Mission Division, RSSD of ESA/ESTEC, Postbus 299, NL-2200AG Noordwijk, the Netherlands email: [email protected]
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We discuss recent X-ray studies of stellar cycles and long-term variability.
Favata, F., Micela, G., Baliunas, S. L., Schmitt, J. H. M. M., Guedel, M., Harnden, F. R., Sciortino, S., & Stern, R. A.2004, A&A (Letters), 418, L13Google Scholar
Hempelmann, A., Schmitt, J. H. M. M., Baliunas, S. L., & Donahue, R. A.2003, A&A (Letters), 406, L39Google Scholar