Färgmagnituddiagrammet
Färgmagnituddiagrammet, often abbreviated as CMD, is a fundamental tool in astrophysics used to study star clusters and galaxies. It is a scatter plot that displays the apparent magnitude of stars against their color index. Apparent magnitude is a measure of how bright a star appears from Earth, while color index is derived from the difference in a star's brightness measured through two different colored filters, typically blue (B) and visible (V). A bluer star will have a lower B-V color index, while a redder star will have a higher B-V color index.
When stars of a single population, like those in a star cluster, are plotted on a CMD,
The shape and features of a CMD provide valuable information about the age and composition of the