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The Coronet Cluster in the nearby R CrA dark cloud offers the rareopportunity to study at least four "class I" protostellar sources as well asone candidate "class 0" source, a Herbig Ae star, and a candidate brown dwarfwithin a few square arcminutes - most of them detected at radio- and X-raywavelengths. These sources were observed with the Very Large Array (VLA) at3.5cm on nine occasions in 1998, spread over nearly four months. The source IRS5, earlier shown to emit circularly polarized radio emission, was observed toundergo a flux increase accompanied by changes in its polarization properties.Comparison with VLA measurements taken in January 1997 allows for some analysisof longer-term variability. In addition to this radio monitoring, we analyzearchival Chandra and XMM-Newton X-ray data of these sources. Three class Iprotostars are bright enough for X-ray spectroscopy, and we perform avariability analysis for these sources, covering a total of 154 ksec spreadover more than two and a half years. Also in X-rays, IRS 5 shows the mostpronounced variability, whilst the other two class I protostars IRS 1 and IRS 2have more stable emission. X-ray data is also analyzed for the recentlyidentified candidate class 0 source IRS 7E, which shows strong variability aswell as for the Herbig Ae star R CrA for which we find extremely hotX-ray-emitting plasma. For IRS 1,2 and 5, the hydrogen column densities derivedfrom the X-ray spectra are at about half the values derived with near-infraredtechniques, a situation similar to what has been observed towards some otheryoung stellar objects.Comment: 17 pages, 11 figures, accepted for publication in A&

Radio and X-ray variability of young stellar objects in theCoronetcluster