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Photometric Evidence of Instability in Eclipsing Systems

Published online by Cambridge University Press:  14 August 2015

Frank Bradshaw Wood
Frank Bradshaw Wood*
Affiliation:
Flower and Cook Observatories, Philadelphia, Pennsylvania, U.S.A.

Extract

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Many eclipsing variables exhibit characteristics that indicate lack of stability. Physically, these systems range from certain short-period dwarfs, which show irregular brightness fluctuations unexplainable by any normal eclipse hypothesis, to systems such as AO Cassiopeiae: class O super-giants whose periods, velocity curves, and light curves have shown remarkable variations. Included are systems having one Wolf-Rayet component and probably one old nova. Many eclipsing binaries show erratic changes of period that are difficult to explain on any concept of a stable system. Indeed, when we consider the physical conditions which must prevail when two stars are located with their surfaces only a few hundred thousand miles from each other, perhaps we should be surprised that the irregularities are not larger.

Type
V. Phenomena of Instability in Binary Systems
Information
Symposium - International Astronomical Union , Volume 3: Non-Stable Stars , 1957 , pp. 144 - 158
Copyright
Copyright © Cambridge University Press 1957 

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