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Multi-wavelength (X-ray to radio) monitoring of Young Stellar Objects (YSOs)can provide important information about physical processes at the stellarsurface, in the stellar corona, and/or in the inner circumstellar disk regions.While coronal processes should mainly cause variations in the X-ray and radiobands, accretion processes may be traced by time-correlated variability in theX-ray and optical/infrared bands. Several multi-wavelength studies have beensuccessfully performed for field stars and approx. 1-10 Myr old T Tauri stars,but so far no such study succeeded in detecting simultaneous X-ray to radiovariability in extremely young objects like class I and class 0 protostars.Here we present the first simultaneous X-ray, radio, near-infrared, and opticalmonitoring of YSOs, targeting the Coronet cluster in the Corona Australisstar-forming region, which harbors at least one class 0 protostar, severalclass I objects, numerous T Tauri stars, and a few Herbig AeBe stars. [...]Seven objects are detected simultaneously in the X-ray, radio, andoptical/infrared bands; they constitute our core sample. While most of thesesources exhibit clear variability in the X-ray regime and several also displayoptical/infrared variability, none of them shows significant radio variabilityon the timescales probed. We also do not find any case of clearlytime-correlated optical/infrared and X-ray variability. [...] The absence oftime-correlated multi-wavelength variability suggests that there is no directlink between the X-ray and optical/infrared emission and supports the notionthat accretion is not an important source for the X-ray emission of these YSOs.No significant radio variability was found on timescales of days.Comment: 11 pages, 11 figures, accepted for publication in A&A (06 Dec 2006

Simultaneous X-ray, radio, near-infrared, and optical monitoring of young stellar objects in theCoronetcluster