Content deleted Content added
Removed {{Proposed deletion/dated}} tag: per WP:DEPROD |
Made "T Tauri stars" into a link. |
||
Line 5:
* Group I variables are split into subgroups IA (spectral types O to A) and IB (spectral types F through M).
* [[Orion variables]], GCVS type IN (irregular and nebulous), 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 star|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.
| |||