EAS Publications Series
Volume 9, 2003Magnetism and Activity of the Sun and Stars
|Page(s)||307 - 307|
|Published online||17 November 2003|
J. Arnaud and N. Meunier (eds)
EAS Publications Series, 9 (2003) 307
Activity of protostars and brown dwarfs
Max-Planck-Institut für extraterrestrische
Physik, P.O. Box 1312, 85741 Garching bei München, Germany
The first evidences for magnetic activity in low-mass protostars and brown dwarfs were found in the mid-1990's by the old generation of X-ray satellites, namely ROSAT and ASCA. I will show that these first X-ray detections have opened a promising observational window to study the activity of protostars, deeply embedded in their molecular cloud and optically invisible. However these early observations gave only access to the tip of the iceberg, detecting protostars mainly during phases of high activity. I will review recent results obtained with the new generation of X-ray satellites, namely Chandra and XMM-Newton, which now give access to the X-ray spectral study of protostars also during their quiescent phase, and which are also enough sensitive to detect young brown dwarfs in star-forming regions. I will also review evidences of activity from radio observations, and for brown dwarfs, evidences of activity from optical observations.
© EAS, EDP Sciences, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.