The observation of globular star clusters is important because they are among the oldest objects in the universe and are key to understanding the evolution of stars and galaxies. In this master's thesis, we focus on measuring the surface brightness of five globular clusters with a 25-cm robotic telescope and a digital CCD-camera over the course of one night. The resulting images are calibrated, processed, and analyzed to obtain the surface brightness of the clusters, which is fitted with a three-parameter King model that can be used to determine the parameters of the observed clusters using the virial theorem. This activity demonstrates that star clusters can be successfully analyzed using simple school equipment and is, therefore, suitable for use in an astronomy elective, science day, or astronomy club.
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