Which star is known as the Demon Star and is found in Perseus?

The star known as the Demon Star, which is located in the constellation Perseus, is Algol. This name stems from the Arabic phrase "al-ghul," which translates to "the ghoul" or "demon," reflecting its historical associations with ill omens and superstition.

Algol is a well-studied eclipsing binary star system, where the brightness of the star diminishes periodically as one component passes in front of the other relative to Earth. This variability was recognized long ago, with its period of brightness changes being approximately 2.87 days. This unique feature led to Algol's reputation as the Demon Star due to its fluctuating light, which can be interpreted as an ominous sign by various cultures.

In contrast to the other stars mentioned, Antares is known as the heart of the Scorpius constellation and has no association with the moniker of Demon Star. Vega, located in the Lyra constellation, is a bright blue-white star known for its significance in astronomy and common visibility in the night sky, while Castor, found in the Gemini constellation, is another prominent star system unrelated to the name or characteristics associated with Algol. Thus, in the context of Perseus and the nickname Demon Star