Respuesta :
Answer:
d
Explanation:
There are two basic types of variable stars: intrinsic variables, whose luminosity actually changes, and extrinsic variables, whose apparent changes in brightness are due to changes in the amount of their light that can reach Earth. A star could be an intrinsic variable because it periodically swells and shrinks.
Extrinsic and intrinsic are the two types of variable stars.
Answer: Option D
Explanation:
Intrinsic variable whose luminosity changes, and extrinsic variable, whose brightness variation are due to alter in their light amount that can attain the earth. Intrinsic variables, in which variations are caused by star's physical change or stellar systems.
On the other hand, variability is due to one star's eclipse by another or stellar rotation effect denoted as extrinsic. Hence, there are two kinds of variable stars which are namely: extrinsic and intrinsic.
