A recent circular issued by the Astronomical Observatory makes a plea for co-operation in observing variable stars. The number of variable stars of long period is now so great that the observation of ...
The study of the ‘demon star,’ Algol, made by a research group of the University of Helsinki, Finland, has received both scientific and public attention The study of the “Demon star”, Algol, made by a ...
THE careful and persistent observation of variable stars has risen from being the occasional hobby of a few observers to one of the most important branches of stellar physics, from which far-reaching ...
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