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" ... *A habitable planet in orbit around one of these puffed up stars would absolutely have a much tougher time in developing life, says Pinsonneault. Associated with the starspots, you tend to have very strong emission of x-rays and ultraviolet light, he says. ... "
" ... All stars “flicker” - change their brightness slightly from one moment to the next. This may originate from the star’s magnetic field, created as the star rotates. When this magnetic field becomes unstable near the surface of the star, it can form “starspots” (dark regions on the star) or bright spots called faculae on the star - changing the overall brightness of the star. These events create a more active star. It seems that stars with high rotation rates have high magnetic fields, and hence, a lot of activity. ... "