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   PR # 22149
    Ginga showed that Seyfert 1 galaxies commonly possess an iron K      
    emission line of equivalent width ~150 eV. EXOSAT data, however,shows
    that Mkn290 has a significant iron K emission line of equivalent     
    width 1.2 keV. High equivalent width low energy iron lines are pre-  
    dicted from photoionized accretion disk models. We request a 50 ksec 
    SIS+GIS observation of Mkn290 to study the iron K line and determine 
    whether its origin is in an accretion disk or a partial covering   
    absorber.                                                            
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