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- Orion_variable abstract "An Orion variable is a variable star which exhibits irregular and eruptive variations in its luminosity and is typically associated with diffuse nebulae. It is thought that these are young stars which will later become regular, non-variable stars on the zero-age main sequence. Brightness fluctuations can be as much as several magnitudes.T Tauri stars are Orion variables exhibiting characteristic fluorescent violet emission lines from singly ionized Iron (FeII) in their star spectra, and also emission from Lithium, a metal that usually is destroyed by the nuclear fusion in the stars.FU Orionis stars or simply "Fuors", are Orion variables that rise 5–6 magnitudes, then sink up to one magnitude and stay there for many decades. The prototype is FU Orionis, and other specimens are V1057 Cygni and V1515 Cygni.Of this diverse class of stars, some Orion variables may exhibit a small amplitude (up to 1 magnitude) periodic variation, some are characterized by abrupt fadings, and some show spectral characteristics indicating mass downfall upon the star (YY Orionis stars). Many of these characteristics may occur in any one Orion variable.The term 'Orion Variable' was a handy catch-all term but is now tending to drop out of disuse among the astronomical community, though for historical reasons the GCVS still uses it. Astronomers use more specialised terms which refer to actual physical differences among the 'zoo' of young variable stars, such as 'Classical T Tauri' or 'UX Orionis' stars.".
- Orion_variable wikiPageExternalLink vartype.txt.
- Orion_variable wikiPageID "4964785".
- Orion_variable wikiPageRevisionID "582531931".
- Orion_variable hasPhotoCollection Orion_variable.
- Orion_variable subject Category:Irregular_variables.
- Orion_variable subject Category:Orion_variables.
- Orion_variable type IrregularVariables.
- Orion_variable type OrionVariables.
- Orion_variable type PhysicalEntity100001930.
- Orion_variable type Thing100002452.
- Orion_variable type Variable109468959.
- Orion_variable comment "An Orion variable is a variable star which exhibits irregular and eruptive variations in its luminosity and is typically associated with diffuse nebulae. It is thought that these are young stars which will later become regular, non-variable stars on the zero-age main sequence.".
- Orion_variable label "Estrella variable Orión".
- Orion_variable label "Orion variable".
- Orion_variable label "Variabile Orione".
- Orion_variable label "Variável Órion".
- Orion_variable label "Орионова переменная звезда".
- Orion_variable label "オリオン変光星".
- Orion_variable label "獵戶型變星".
- Orion_variable sameAs Estrella_variable_Orión.
- Orion_variable sameAs Variabile_Orione.
- Orion_variable sameAs オリオン変光星.
- Orion_variable sameAs 오리온_변광성.
- Orion_variable sameAs Variável_Órion.
- Orion_variable sameAs m.0cxfx5.
- Orion_variable sameAs Q1352333.
- Orion_variable sameAs Q1352333.
- Orion_variable sameAs Orion_variable.
- Orion_variable wasDerivedFrom Orion_variable?oldid=582531931.
- Orion_variable isPrimaryTopicOf Orion_variable.