Coronal Activity in the Young Galactic Open Cluster NGC 1039 SQUARE_BRACKET_OPENM34SQUARE_BRACKET_CLOSE

We propose to survey, in Xrays, the young (250 Myr) open cluster NGC 1039. Itsunique astrophysical importance lies in its intermediate age, and the fact thatROSAT Xray observations already exist of the similarly aged (220 Myr) NGC 6475cluster. The Xray characteristics of these middleaged open clusters can thenbe compared to ROSAT (and/or XMM/CHANDRA) observations of the young Alpha Persei(50 Myr), Pleiades (100 Myr) and the older Hyades (700 Myr) clusters. Using thissuite of data, we will be able to delineate the earlytime rotationagemagneticactivity paradigm, so that we can make inferences and physical models of thephysical parameters governing lowmass solartype star evolution during theearly (< 700 Myr) main sequence. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]