References in periodicals archive ?
Most "carbon stars" are long-period or slow irregular variables, and these tend to be reddest when near minimum light.
An introduction to variable stars including a description of the five classes, which were: I) temporary stars, II) long period variables, III) minor irregular variables, IV) short period variables & V) Algol stars.
The programme was further expanded to include the irregular variables U Gem and SS Cyg and the first meeting of the VSS took place on 1906 December 10.
Among these are some irregular variables that the Hipparcos data hint may be semiregulars.
The fourth General Catalogue of Variable Stars classes it among the irregular variables.
These twin irregular variables fluctuate between magnitude 8.
Checking further, she found that Be stars are rapidly spinning, irregular variables, which slowly lose mass to a disk around the star's equator.