A star that dims every three days would likely be a binary star system. Such a system consists of two stars that orbit their mutual center of mass. If their orientation is right then, from out perspective, one star will periodically block the other from view, reducing the amount of light we see from them.
a white dwarf
no
That might be a white dwarf.
white dwarf
I would consider 3 days the maximum for dim sum.
to marry them
No; actually, white dwarves are rather dim.
Proxima Centauri is a very dim red dwarf star, but it is the closest star to our own sun, at a distance of 4.2 light years.
hot, bright stars
Your battery is weak, or your your alternator is not charging battery.
A supergiant star has an atmosphere that extends far from the star's center. On a surface area basis, square meters say, the surface is very dim. But since the size is so great the overall brightness is high. Betelgeuse is a good example. The outer atmosphere is so tenuous that there is actually a star orbiting within it. But it is so large that it shines brightly at the right shoulder of Orion.
The closest known Star to our sun is Proxima Centauri, a small dim red dwarf star around 4.2 light years away.