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Variable Star

(star that varies in magnitude)

A Variable Star is a star which becomes dimmer and brighter over time as seen from Earth. This can be due to changes in the star such as brightening or enlarging, or through a change in whatever the light must pass through to reach us. Examples: Achernar, AD Leonis, Algol, DQ Tau, GG Tau, HL Tau, Lalande 21185, Rigel, Ross 154, Ross 248, T Tauri, Vega.

Stars generally are at least slightly variable, such as the 0.1% variability of the Sun over its 11 year cycle.

A few of the types:

(star type,transient type,variable)

Referenced by:
AD Leonis (AD Leo)
Algol (Beta Per)
Cepheid Variable
Cataclysmic Variable Star (CV)
Dynamical Instability
Frank Ross's Catalog
General Catalogue of Variable Stars (GCVS)
Instability Strip
Lalande 21185
MACHO Project
Partial Ionization Zone
Pre-Main-Sequence Star (PMS)
Ross 154
Ross 248
T Tauri
T-Tauri Star (TTS)
Variable Star Designation