X-ray images of young stellar clusters

Here I have collected a few X-ray images, most of them made from ROSAT observations, which I have used to study the X-ray emission from young stars.
Some of these are simple count rate images, where the pixel intensity is given by the number of photons detected in this pixel. Some, which are labeled as `true colour' images, consist of three overlaid images showing different photon energies.
Photons with energies < 0.5 keV are shown in red,
photons with energies > 0.5 Kev and < 1.0 keV in green,
and those with energies > 1 keV in blue.
The different colours of the stars correspond to different coronal temperatures.

More information about the ROSAT project can be found on the ROSAT pages at MPE
or at HEASARC , where one can also find additional images.