Dischi protoplanetari e campi UV nella regione di formazione stellare Orion A

Dischi protoplanetari in Orion A non mostrano effetti ambientali sulla quantità di materia che accrescono sulla stella centrale   I dischi protoplanetari sono strutture a forma di disco osservate attorno a stelle giovani, tipicamente con un’età inferiore ai 10 milioni di anni. Sono oggetti di grande interesse scientifico per vari motivi, principalmente perché rappresentano la struttura in cui si formano

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Accretion and dispersion of protoplanetary disks. The study: “X-shooter spectroscopy of young stars with disks. The TW Hydrae association as a probe of the final stages of disk accretion” by L. Venuti (Eberhard Karls Universität/Cornell University/NASA) recently published by A&A

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

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