Algol variable stars

Algol variable stars are a type of eclipsing binary star system, where two stars orbit each other. One star, usually more massive, periodically passes in front of the other from our viewpoint on Earth, causing the system's brightness to dim temporarily. This pattern of brightness variation can be predicted and occurs roughly every 2.87 days for the most well-known example, Algol (Beta Persei). The name "Algol" comes from the Arabic word for "ghoul," reflecting its changing light, which has fascinated astronomers and stargazers for centuries.