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20032007
most citedHabitat of early life: Solar X-ray and UV radiation at Earth's surface 4-3.5 billion years ago

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astro-ph2004

XMM-Newton observations of the sigma Ori cluster. I. The complex RGS spectrum of the hot star sigma Ori AB

J. Sanz-Forcada, E. Franciosini, R. Pallavicini

We present XMM-Newton observations of the young (~2-5 Myr) cluster around the hot (O9.5V) star sigma Orionis AB, aimed at obtaining a high resolution RGS spectrum of the hot star a…