Evoluzione interna delle giovani stelle di massa intermedia rivelata dall’abbondanza chimica del Litio Le giovani stelle di massa intermedia (con una massa compresa tra 1.5 e 3.5 masse solari) attraversano un’evoluzione estremamente rapida della propria struttura interna nei primi milioni di anni di vita. Partendo da una configurazione completamente convettiva (in cui l’energia viene trasportata dal nucleo verso l’esterno
At a distance of about 160 light years, the stellar association TW Hydrae is a benchmark for the study of pre-main sequence stars and their protoplanetary disks. Pre-main sequence stars are a few million years old stars, still gravitationally contracting and not powered yet by the thermonuclear reactions. They are often surrounded by disks of dust and gas called “protoplanetary
Pre-Main Sequence stars are young stars (solar type pre-main sequence stars are younger than about 30 million years), that are often observed surrounded by a disc of haas and dust called “protoplanetary discs”. These discs can actively accreting matter onto the central star, with a complex process resulting from a complicated interplay between the gas of the disc and the
