Category: Ricerca

An observation in X-rays of a single star 15 years long…The objective? The understanding of the coronal cycle in stars: do solar-like stars have a coronal cycle such as the one of our Sun?   The term “solar activity” includes all those phenomena observed in the solar photosphere, chromosphere, and corona related to the solar magnetic field, such as sunspots,

A recent press release has appeared on the NASA/Chandra website (link), dedicated to the binary system V745 Sco and the model developed by S. Orlando (INAF-Astronomical Observatory of Palermo), M. Miceli (University of Palermo) e J. J. Drake (Harvard-Smithsonian Center for Astrophysics, US), which explains the nova explosion occurred on February 6th 2014.   V745 Sco is a binary system composed

Star forming regions are complex environments, shaped by the star formation process (which involves gravity, turbulence and magnetic fields) and the interaction between the clouds and the stellar winds and energetic radiation (X-ray and UV) produced by the newborn stars.   The interaction between clouds and stellar wind and radiation is of particular interest. Stellar radiation creates expanding fronts in

Conservation of angular momentum is one of the fundamental laws of physic that every student must deal with. Let’s make an example: if we consider a rotating cloud of dust  and gas of our Galaxy and we let it collapse under its own gravity, and then form stars, the conservation of its angular momentum dictates a faster and faster rotation

Star forming regions form stars in associations or clusters as a consequence of the gravitational collapse of clouds. Typically, in the Milky Way star forming regions form hundreds to few thousands of stars. However, there exist also very massive star forming regions which form tens to hundreds of thousands stars, together with some of the most massive stars known in

di Mario Giuseppe Guarcello    ( segui mguarce)     Le esplosioni di supernovae sono certamente tra i fenomeni più spettacolari che ci offre l’Universo. Questi fuochi d’artificio cosmici che segnano la morte di stelle molto massive rilasciano in pochi secondi l’energia irradiata dal Sole durante i suoi 10 miliardi di anni di esistenza. Gli strati esterni della stella vengono espulsi