The general structure of the classification scheme
Large classes (groups of
types):
1.Eruptive
variable stars
2.Pulsating
variable stars
3.Rotating
variable stars
4.Cataclysmic
(explosive and nova-like) variables
5.Close
binary eclipsing systems
6.Optically
variable close-binary sources of strong variable X-ray radiation
7.
These classes are just a
way to group types; in our opinion, they can be kept if slightly better described (e.g., remove close from
item 5, simplify item 6)