A variable star is a star whose brightness as seen from Earth (its apparent magnitude) changes systematically with time. This variation may be caused...

In astronomy, a semiregular variable star, a type of variable star, is a giant or supergiant of intermediate and late (cooler) spectral type showing considerable...

Variable Star is a 2006 science fiction novel by American author Spider Robinson, based on the surviving seven pages of an eight-page 1955 novel outline...

Look up Variable, variable, or variables in Wiktionary, the free dictionary. Wikiversity has learning resources about Variable Variable may refer to:...

In astronomy, cataclysmic variable stars (CVs) are stars which irregularly increase in brightness by a large factor, then drop back down to a quiescent...

In astronomy, a variable-star designation is a unique identifier given to variable stars. It extends on the Bayer designation format, with an identifying...

binary, with the optical counterpart being a variable star. Sirius is another binary and the brightest star in the night time sky, with a visual apparent...

A Cepheid variable (/ˈsɛfi.ɪd, ˈsiːfi-/) is a type of variable star that pulsates radially, varying in both diameter and temperature. It changes in brightness...

Catalogue of Variable Stars does not define a long-period variable star type, although it does describe Mira variables as long-period variables. The term...

a highly magnetic type of cataclysmic variable (CV) binary star system, originally known as an AM Herculis star after the prototype member AM Herculis...

of variable stars that are less than about ten million years old. This class is named after the prototype, T Tauri, a young star in the Taurus star-forming...

The American Association of Variable Star Observers (AAVSO) is an international nonprofit organization. Founded in 1911, the organization focuses on coordinating...

Distance Ladder. Springer. AAVSO Variable Star of the Month. W Virginis: Spring 2003 PDF / HTML OGLE Atlas of Variable Star Light Curves - W Virginis stars...

these "cluster-type" variables were being rapidly identified in the mid-1890s, especially by E. C. Pickering. Probably the first star definitely of RR Lyrae...

discovered to be variable, for example δ Sct variables named after the star δ Sct. The first luminous blue variable to be identified as a variable star was P Cygni...

Mira variables /ˈmaɪrə/ (named for the prototype star Mira) are a class of pulsating stars characterized by very red colours, pulsation periods longer...

the size of the star. This category includes Cepheid and Cepheid-like stars, and long-period variables such as Mira. Eruptive variables are stars that...

A flare star is a variable star that can undergo unpredictable dramatic increases in brightness for a few minutes. It is believed that the flares on flare...

variable is a type of variable star in which variations in brightness show no regular periodicity. There are two main sub-types of irregular variable:...

Variable Star Observers. Retrieved 12 March 2014. Watson, Christopher (4 January 2010). "T Crucis". AAVSO Website. American Association of Variable Star...

the north pole star. Polaris, the brightest star in the constellation, is a yellow-white supergiant and the brightest Cepheid variable star in the night...

13, 1987) was an American astronomer and an American Association of Variable Star Observers merit award winner. She made an estimated 78,876 astronomical...

M-type red supergiant star nearing the end of its life. It is the second brightest star in Orion, and is a semiregular variable star. It serves as the "right...

E. N. (2009-01-01). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+, 2007-2017)". VizieR Online Data Catalog: B/gcvs. Bibcode:2009yCat...

(pl. novae), or U Geminorum variable, is one of several types of cataclysmic variable star, consisting of a close binary star system in which one of the...

luminosity making it a candidate luminous blue variable about 1.6 million L☉ (one third as luminous as the binary star system Eta Carinae), hence a radius of...

where these are visual magnitudes, otherwise from the International Variable Star Index (VSX). Spectral types are taken from the GCVS, which may differ...

It is the second-brightest star in the constellation and is an unconfirmed variable star. ζ Aql (Okab) is a binary star of magnitude 3.0, 83 light-years...

Website. American Association of Variable Star Observers. Retrieved 5 February 2014. "Zeta Canis Majoris – Cepheid Variable". SIMBAD Astronomical Database...

particularly interesting variable in Aries is SX Arietis, a rotating variable star considered to be the prototype of its class, helium variable stars. SX Arietis...