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- Q1352333 subject Q8555188.
- Q1352333 subject Q9680465.
- Q1352333 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.".
- Q1352333 wikiPageExternalLink vartype.txt.
- Q1352333 wikiPageWikiLink Q105902.
- Q1352333 wikiPageWikiLink Q1141054.
- Q1352333 wikiPageWikiLink Q179600.
- Q1352333 wikiPageWikiLink Q190382.
- Q1352333 wikiPageWikiLink Q2733236.
- Q1352333 wikiPageWikiLink Q3450.
- Q1352333 wikiPageWikiLink Q42372.
- Q1352333 wikiPageWikiLink Q568.
- Q1352333 wikiPageWikiLink Q6232.
- Q1352333 wikiPageWikiLink Q6243.
- Q1352333 wikiPageWikiLink Q677.
- Q1352333 wikiPageWikiLink Q8555188.
- Q1352333 wikiPageWikiLink Q957044.
- Q1352333 wikiPageWikiLink Q9680465.
- Q1352333 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.".
- Q1352333 label "Orion variable".