The orbital period of Algol - 1964 to 1978

Astronomy and Astrophysics – Astronomy

Scientific paper

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Algol, Eclipsing Binary Stars, Electrophotometry, Orbital Elements, Stellar Spectrophotometry, Stellar Mass Accretion, Stellar Mass Ejection, Stellar Radiation

Scientific paper

A photoelectric observation of minimum light for Algol is reported: JD 2443565.5785 (visual) and JD 2443565.5802 (blue). The times of minima obtained between 1964 and 1978 indicate that a period decrease may have occurred about 1975. It is suggested that this period change, as well as the radio and X-ray activity and spectroscopic anomalies observed during 1975, may have been due to a mass-transfer event that occurred around that time.

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