How a 'chromosome map' is created

This article shows additional visualisations to the publication Kamann et al. 2019. Feel free to use them in your presentations.

Here, the colour magnitude diagram of the core of NGC 3201 (HST/ACS catalogue, Sarajedini+, 2007) is shown.

With focus on the RGB it is possible to rectify several filter combinations and end up with the so called 'chromosome map':

This can for example be used to analyse the binary star content:

And shows in this case that NGC 3201 seems to have more binaries in the lower population than in the upper