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astro-ph1999
The active binary star IIPeg with BeppoSAX
S. Covino, G. Tagliaferri, R. Pallavicini +2
IIPeg is an ideal target to study stellar activity and flares, since intense and long lasting flares have been frequently detected from this system at all wavelengths. We report he…
astro-ph1999
The pulsational behaviour of variable stars in the lower part of the instability strip
Ennio Poretti
The lower part of the classical instability strip and the surrounding main sequence are populated by a large variety of pulsating variable stars. In the past years a great effort w…
astro-ph1999
Asteroseismology of Cepheids
Ennio Poretti
The importance of Cepheids is well known in many fields of astronomy. Section 2 introduces the Fourier decomposition, a tool to describe quantitatively the light curves of pulsatin…