stars, star catalogues, star data, variables, double and multiple stars,main stars of the constellations

selected types of variable stars

physical		optical
pulsating variables	eruptive variables	optical
cepheids d Cephei type W Virginis type Mira type RR Lyrae type BY Draconis type a Cygni type d Scuti type b Cephei type RV Tauri type a² Canum venaticorum type	Orion variables T Tauri type U Geminorum type SS Cygni type SU Ursae maioris type Z Camelopardalis type R Coronae borealis type UV Ceti type	Algol type b Lyrae type W Ursae maioris type