EV Lacertae is a dinky star, a cool red dwarf about 16 light years away. It really is small; its diameter is about 0.4 times that of the Sun, and it's so faint that if it weren't one of the closest stars to us we wouldn't be able to see it at all. Even though it's a close neighbor, it's still too faint to see with the naked eye, and is tough even in binoculars. So it's not very interesting, right? Heh. Bzzzzt.
EV Lac is almost fully convective, which means that the heat from hydrogen fusion in its core is transported upwards almost entirely due to hot gas rising. In more massive stars like the Sun, that heat is transported through radiation, literally through light. What this means is that almost all the gas inside EV Lac is moving up and down, rising and falling like water boiling in ...
