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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 the Solar Cycle.

A few of the types:

The details of the observed variation offer clues to the sources of variation, often revealing or confirming models of Stellar Structure for the given star, for its particular variable-star type, and for stars in general. In this sense, variable stars are analogous to binary stars, which also serve as windows into stellar detail.


(star type,transient type,variable)
http://en.wikipedia.org/wiki/Variable_star
http://en.wikipedia.org/wiki/Polar_(star)
http://en.wikipedia.org/wiki/BY_Draconis_variable
http://en.wikipedia.org/wiki/RS_Canum_Venaticorum_variable
http://en.wikipedia.org/wiki/Flare_star

Referenced by:
Achernar
AD Leonis (AD Leo)
Algol (Beta Per)
APASS
Cepheid Variable
Contact Binary
Cataclysmic Variable Star (CV)
Dynamical Instability
EROS
Frank Ross's Catalog
FU Orionis Star (FUor)
General Catalogue of Variable Stars (GCVS)
Instability Strip
KIC 8462852
Lalande 21185
Messier 15 (M15)
MACHO Project
Pan-STARRS
Partial Ionization Zone
Pulsating Star
Rigel
Ross 154
Ross 248
RR Lyrae Variable
Sunspot
T Tauri
T-Tauri Star (TTS)
Variable Star Designation
Vega

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