Class: FUOrionis

Variable Star of FU Ori type

•owl:Thing
        •AstrObject
                •VariableObject
                        •EruptiveVariableStar
                                •FUOrionis

Super Classes

EruptiveVariableStar

Annotations

misc:descriptionOrion variables (eruptive) of the FU Orionis type. Characterized by gradual increases in brightness by about 6 mag in several months, followed by either almost complete constancy at maximum that is sustained for long periods of time or slow decline by 1-2 mag. Spectral types at maximum are in the range Ae(alpha) - Gpe(alpha). After an outburst, a gradual development of an emission spectrum is observed and the spectral type becomes later. These variables probably mark one of the evolutionary stages of T Tauri-type Orion variables, as evidenced by an outburst of one member, V1057 Cyg, but its decline (2.5 mag in 11 years) commenced immediately after maximum brightness was attained. All presently known FU Ori variables are coupled with reflecting cometary nebulae.
simbad:nameFUOr*
simbad:shortCodeFU*
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