Abstract
Pre-main sequence solar-type stars are at least three order of magnitude more X-ray luminous than mid-aged stars such as the Sun, making X-ray surveys a very powerful tool to study young stars. Specifically X-ray observations of star forming regions or young open clusters are very effective to identify cluster members among the huge number of older field stars present in the same sky region. This capability is very useful in particular to select stars that have already dissipated their disks (weak line type or Class III stars), that cannot be identified with more traditional means such as infrared surveys. As a consequence X-ray surveys are crucial to obtain complete samples needed for the study of global properties of the clusters, such as Initial Mass Functions (IMF) and disk frequency. I will present some examples of such studies with special emphasis on the role of X-ray observations.
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Acknowledgements
The author acknowledges support by the EC MC RTN CONSTELLATION (MRTNCT2006035890) and by the PRIN-INAF (P.I. Lanza).
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Micela, G. (2012). The Relevance of X-ray Surveys for the Study of the Properties of Young Open Clusters. In: Moitinho, A., Alves, J. (eds) Star Clusters in the Era of Large Surveys. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22113-2_24
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