All the magnetic phenomena occurring in stars, such as flares and spots, are called “stellar activity”. Astronomers study stellar activity using different diagnostics such as X-ray emission from the coronae and spectroscopic indices like the R’HK measuring the chromospheric activity. This is an important research field in stellar astronomy, given that stellar activity is connected to the intensity and morphology
The analysis of radial velocity is one of the two main methods used to detect exoplanets. This method consists in measuring the Doppler effect on stellar spectra deriving the velocity component along the line of sight (the radial velocity). If the star has a planet, they both orbit around the common center of mass, producing periodic oscillations of the osberved
Il 16 Marzo alle 15:30 presso l’aula A del Dipartimento di Fisica e Chimica dell’Università di Palermo, Via Archirafi 36, IL prof. G. Peres (Specola Universitaria, Dip. di Fisica e Chimica, Univ. degli Studi di Palermo) ed il direttore dell’Osservatorio Astronomico di Palermo G. Micela (INAF, Osservatorio Astronomico di Palermo “G.S. Vaiana”) terranno due seminari su esopianeti ed abitabilità.
