X-ray emission as an indicator of stellar youth is important for studies of star-forming regions. Most star-forming regions in the Milky Way Galaxy are projected on Galactic-Plane fields with numerous unrelated field stars. It is often impossible to distinguish members of a young stellar cluster from field-star contaminants using optical and infrared images alone. X-ray emission can easily penetrate moderate absorption from molecular clouds, and can be used to identify candidate cluster members.
x-ray emission as an indicator of stellar youth is important for studies of star-forming regions most star-forming regions in the milky way galaxy are projected on galactic-plane fields with numerous unrelated field stars it is often impossible to distinguish members of a young stellar cluster from field-star contaminants using optical and infrared images alone x-ray emission can easily penetrate moderate absorption from molecular clouds and can be used to identify candidate cluster members