Irregular variable: Difference between revisions

Revision as of 19:15, 29 October 2008

Revision as of 19:17, 29 October 2008

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* Group I variables are split into subgroups IA (spectral types O to A) and IB (spectral types F through M).

* So-called[[Orion variables]], GCVS type IN (irregular and nebulous) variables, indigenous to star-forming regions, may vary by several magnitudes with rapid changes of up to 1 magnitude in 1 to 10 days, are similarly divided by spectral type into subgroups INA and INB, but with the addition of another subgroup, INT, for T Tauri stars, or INT(YY) for YY Orionis stars.

* The third category of eruptive irregulars are the IS stars, which show rapid variations of 0.5 to 1 magnitude in a few hours or days; again, these come in subgroups ISA and ISB.

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<references />

[[Category:Irregular variables| ]]

[[Category:Irregular variables| ]]

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