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21 relations: American Association of Variable Star Observers, Asymptotic giant branch, Carbon star, Cepheid variable, General Catalogue of Variable Stars, Giant star, La Superba, List of largest stars, Mira variable, Normal mode, Optical Gravitational Lensing Experiment, Overtone, RV Tauri variable, S-type star, Semiregular variable star, Stellar classification, Supergiant star, V Aquilae, Variable star, VX Sagittarii, VY Canis Majoris.
American Association of Variable Star Observers
Since its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators.
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Asymptotic giant branch
The asymptotic giant branch (AGB) is a region of the Hertzsprung–Russell diagram populated by evolved cool luminous stars.
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Carbon star
A carbon star is typically an asymptotic giant branch star, a luminous red giant, whose atmosphere contains more carbon than oxygen; the two elements combine in the upper layers of the star, forming carbon monoxide, which consumes all the oxygen in the atmosphere, leaving carbon atoms free to form other carbon compounds, giving the star a "sooty" atmosphere and a strikingly ruby red appearance.
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Cepheid variable
A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude.
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General Catalogue of Variable Stars
The General Catalogue of Variable Stars (GCVS) is a list of variable stars.
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Giant star
A giant star is a star with substantially larger radius and luminosity than a main-sequence (or dwarf) star of the same surface temperature.
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La Superba
La Superba (Y CVn, Y Canum Venaticorum) is a variable star in the constellation Canes Venatici, well known for its strikingly red appearance.
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List of largest stars
Below is an ordered list of the largest stars currently known by radius.
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Mira variable
Mira variables ("Mira", Latin, adj. - feminine form of adjective "wonderful"), named for the prototype star Mira, are a class of pulsating variable stars characterized by very red colours, pulsation periods longer than 100 days, and amplitudes greater than one magnitude in infrared and 2.5 magnitude at visual wavelengths.
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Normal mode
A normal mode of an oscillating system is a pattern of motion in which all parts of the system move sinusoidally with the same frequency and with a fixed phase relation.
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Optical Gravitational Lensing Experiment
The Optical Gravitational Lensing Experiment (OGLE) is a Polish astronomical project based at the University of Warsaw that runs a long-term variability sky survey (1992-present).
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Overtone
An overtone is any frequency greater than the fundamental frequency of a sound.
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RV Tauri variable
RV Tauri variables are luminous variable stars that have distinctive light variations with alternating deep and shallow minima.
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S-type star
An S-type star (or just S star) is a cool giant with approximately equal quantities of carbon and oxygen in its atmosphere.
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Semiregular variable star
Semiregular variable stars are giants or supergiants of intermediate and late spectral type showing considerable periodicity in their light changes, accompanied or sometimes interrupted by various irregularities.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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Supergiant star
Supergiants are among the most massive and most luminous stars.
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V Aquilae
V Aquilae (V Aql) is a carbon star in the constellation Aquila.
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Variable star
A variable star is a star whose brightness as seen from Earth (its apparent magnitude) fluctuates.
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VX Sagittarii
VX Sagittarii is a red supergiant or red hypergiant located more than 1.5 kiloparsec away from the Sun in the constellation of Sagittarius.
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VY Canis Majoris
VY Canis Majoris (VY CMa) is an extreme pulsating red hypergiant (or supergiant) star located in the constellation Canis Major.
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LPV star, LPV stars, Long period variable, Long period variable star, Long period variable stars, Long period variables, Long-Period Variable Star, Long-period variable, Long-period variable stars, Long-period variables, Long-period-variable, Long-period-variable star, Long-period-variable stars, Long-period-variables, OGLE small amplitude red giant.
References
[1] https://en.wikipedia.org/wiki/Long-period_variable_star
