F - type star

F - type stars are yellow - white warmer equivalents to our sun, Sol. They have a large Habitable Zone, that can support multiple planets. Their luminosity is stronger, their mass is slightly larger then Sol, but also the solar wind is more powerful.

The star
The most known F - type star is Procyon. These kind of stars are more rare in the Universe then G - type stars like Sol and far more rare then K - type stars. Their surface temperature is of 6000 ... 7600 K.

Luminosity is up to some point similar to that of Sol, containing infrared, ultraviolet and visible light. The output of ultraviolet light is higher, so an ozone layer is needed. The star generates a lot of light in visible spectra, but it produces more blue light then red. The infrared emission is also present. Solar winds are stronger then what sol generates. Around such a star, solar flares are not a so important, compared to this continuous solar blow.

F - class stars have a shorter lifetime then Sol and gradually transform into red giants, before ending into a white dwarf. This is not a problem compared with the life of a human settler. What is important is that settlers can find these stars in different stages of their existence. One star might be following main sequence, while another one is starting to fuse helium and slowly becoming a red giant. These transformations have strong effects on hosted planets.