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12 relations: FU Orionis, FU Orionis star, Ionization, Iron, Irregular variable, Lithium, Luminosity, Main sequence, Nebula, Stellar classification, T Tauri star, Variable star.
FU Orionis
FU Orionis is a variable star in the constellation of Orion, that in 1937 rose in apparent visual magnitude from 16.5 to 9.6, and has since been around magnitude 9.
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FU Orionis star
In stellar evolution, an FU Orionis star (also FU Orionis object, or FUor) is a pre–main-sequence star which displays an extreme change in magnitude and spectral type.
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Ionization
Ionization or ionisation, is the process by which an atom or a molecule acquires a negative or positive charge by gaining or losing electrons to form ions, often in conjunction with other chemical changes.
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Iron
Iron is a chemical element with symbol Fe (from ferrum) and atomic number 26.
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Irregular variable
An irregular variable is a type of variable star in which variations in brightness show no regular periodicity.
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Lithium
Lithium (from lit) is a chemical element with symbol Li and atomic number 3.
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Luminosity
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
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Main sequence
In astronomy, the main sequence is a continuous and distinctive band of stars that appear on plots of stellar color versus brightness.
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Nebula
A nebula (Latin for "cloud" or "fog"; pl. nebulae, nebulæ, or nebulas) is an interstellar cloud of dust, hydrogen, helium and other ionized gases.
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Stellar classification
In astronomy, stellar classification is the classification of stars based on their spectral characteristics.
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T Tauri star
T Tauri stars (TTS) are a class of variable stars associated with youth.
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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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Orion variables, YY Orionis star.
