Coronae in the Coronet: simultaneous X-ray to radio monitoring of a young stellar cluster
Forbrich, J.; Preibisch, Th.; Menten, K. M.
Memorie della Societa Astronomica Italiana, v.78, p.301-303 (2007)
Abstract
X-ray to radio multi-wavelength monitoring of Young Stellar Objects (YSOs) can provide important information about physical processes at the stellar surface, in the stellar corona,
and/or in the inner circumstellar disk regions. While several multi-wavelength studies have been performed for field stars and ˜ 1-10 Myr old T Tauri stars, no such study so far has
succeeded in detecting simultaneous X-ray to radio variability in very young objects like class I and class 0 protostars. Here, we present results of the first simultaneous X-ray,
radio, near-infrared, and optical monitoring of the YSOs in the Coronet cluster, located in the Corona Australis star-forming region. Seven YSOs are detected simultaneously in the
X-ray, radio, and optical/infrared bands. Most of these exhibit clear intra-band variability in the X-ray, optical and infrared data, but none show significant radio variability.
No evidence for time-correlated multi-wavelength variability is found. This result suggests that there is no direct link between the emission in the different wavelength ranges and
supports the notion that accretion is not an important source for the X-ray emission of these YSOs. Furthermore, the deep X-ray and infrared data of the Coronet region provide a
complete census of YSOs in this star-forming region.
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