RESTLESS DAYS OF THE INFANT SUN

The earliest stages of the Sun.s life were fundamentally important for theformation of planetary seeds, physical and chemical processes in the SolarNebula, the dissipation of leftover molecular material, the formation,distribution, and binding of water (e.g., in Oortcloud comets, in the giantplanets, or on Earth and Mars), and the chemistry of the forming planetaryatmospheres. The principal goal of the present proposal is a study of thepremain sequence highenergy life of our Sun by investigating a sample of starsof approximately one solar mass with known ages in the nearby Chamaeleon I starformation region. The large effective area of the XMMNewton EPIC cameras allowsus to conduct a spectroscopic Xray study of the PMS Xray Sun in Time. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]