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We lack a reliable scenario for the formation and evolution of stars and their planetary systems , involving key factors such as magnetic fields and turbulence. We present the case for a mission concept that will clarify these problems and give us a global view of the evolution of combined star and planetary systems. This will be achieved by simultaneously(More)
During the course of UBV photoelectric measurements made at the Catania Astrophysical Observatory we have observed an unusually intense optical flare on the nearby M dwarf G 102-21, the optical counterpart of a strong X-ray source recently detected by ROSAT. The amplitude of the magnitude increase (∆U ∼ 7.3 mag) and the total energy release in the UBV bands(More)
We present the results of an X-ray observation of the binary system AR Lacertae (HD 210334) obtained with the Low and Medium Energy Concentrator Spectrometers (LECS & MECS) and with the Phoswich Detector System (PDS) on board the Beppo-SAX satellite. Two flare episodes with comparable peak luminosities were detected, one in each of the two runs into which(More)
We present simultaneous and continuous observations of the Hα, Hβ, He  D 3 , Na  D 1 ,D 2 doublet and the Ca  H & K lines for the RS CVn system HR 1099. The spectroscopic observations were obtained during the MUSICOS 1998 campaign involving several observatories and instruments, both echelle and long-slit spectrographs. During this campaign, HR 1099 was(More)
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