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Algol (beta Per, estrella del demonio)
Sistema eclipsante compuesto de al menos tres componentes (B8 V, K0, Am). El período de componentes A y B es de alrededor de 68.8 horas; el período de los componentes A, B y C es de alrededor de 1.9 años. Las observaciones a largo plazo también indican un cuarto componente enorme y no visto con un período de alrededor de 190 años.
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