Article: Study results from E. Flaccomio and colleagues update understanding of astrophysics.

According to recent research from Palermo, Italy, "The infrared [Ne II] and [Ne III] fine structure lines at 12.81 mu m and 15.55 mu m have recently been theoretically predicted to trace the circumstellar disk gas subject to X-ray heating and ionization. We observationally investigate the origin of the neon fine structure line emission by comparing observations with models of X-ray irradiated disks and by searching for empirical correlations between the line luminosities and stellar and circumstellar parameters."

"We select a sample of 28 young stellar objects in the rho Ophiuchi star formation region for which good quality infrared and X-ray data have been ...

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