A recent article summarized on astrobites states that a star can capture WIMPS [hypothetical dark matter (DM) particles]. These DM particles can transport energy out of the star via collisions BUT do not contribute to radiation pressure since they do not interact/emit photons.

For high DM density environments [dwarf spheroidal galaxies] where a star captures many DM particles, the energy carried away from the inner stellar core can exceed the energy produced there! [see article]

This forces properties of the star to change and alters its position on the HR diagram.

 

Article:

http://astrobites.com/2012/02/08/dark-matter-inside-a-star/

Paper:

http://arxiv.org/abs/1201.5387

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