X-ray variability in the Orion nebula

Abstract

We have examined each of the 172 EINSTEIN X–ray sources in Orion for both short (100–10,000 seconds) and long (1 day to 2 years) timescale variability. No strong flares were seen in 75,000 total seconds of observations. We compare the Orion variability results with those from the ρ Oph star–forming region, solar X–ray flares and dMe U–band flares.