...Algol is one type of these regular variables,having a period of 68...
George C. Comstock 「A Text-Book of Astronomy」
...The variables T and R are oflittle interest to us, for they never become bright enoughto be seen without the aid of a telescope...
Garrett Serviss 「Pleasures of the telescope」
...The variables S and R are both red...
Garrett Serviss 「Pleasures of the telescope」
...27 stars having this spectrum are variables of long period of thesame type as Md...
Carl Vilhelm Ludvig Charlier 「Lectures on Stellar Statistics」
...Roberts, in South Africa, has done splendid work on the periods of variables ofthe Algol type...
George Forbes 「History of Astronomy」
...Yet, again, a third class of doublestars has made itself known in the “Algol variables...
E. Walter Maunder 「Are the Planets Inhabited?」
...The number of known variables of the Algol type is, so far, small; notmuch indeed over thirty...
Cecil G. Dolmage 「Astronomy of To-day」
...Are all other stars constant in brightness? The example ofMira Ceti and of other known variables makes this at least doubtful...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...—On the other hand, some variablestars present an almost perfect regularity, repeatingtheir changes time after time with a precision like that ofclockwork...
George C. Comstock 「A Text-Book of Astronomy」
...—In addition to thesethere is a certain further number of binary variables inwhich both components are bright and where the variationof brightness follows a very different course...
George C. Comstock 「A Text-Book of Astronomy」
...Bailey's observations show that variablestars sometimes exist in large numbers in clusters, althoughthe variables thus observed are of short period...
Garrett Serviss 「Pleasures of the telescope」
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offending Newkirk Olmsted
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