Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 395
sing Variables.—(a) Algol.The variability of Algol (S Persei) was discovered by JohnGoodricke (1764-1786), although the name (the demon 346 GENERAL ASTRONOMY star) suggests that its variability was known to the Arabs longbefore. The Kght curve is shown in Fig. 101. The magnitudeis about 2-3 m. at… … Hours 0 10 20 30 40 50 60Fig. 101.—The Light Curve of Algol. increase again and reaches its original value after a furtherperiod of five hours. About twenty-five hours later, there is asecondary drop in magnitude of about 0-05 m. The wholeperiod is 2-867301 days, or nearly 69 hours. From an…
Astronomy
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