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Information × Registration Number 0307U009026, 0106U012585 , R & D reports Title The protoplanetary disks of stars untill the main sequence popup.stage_title спостереження обраних Ае/Ве зірок Хербіга Head Rostopchina-Shakhovskaya A.N., Registration Date 14-12-2007 Organization Scientific-research institute "Crimean astrophysical observatory" popup.description2 Cyclic variations of H-alpha emission with time-scale of about 1200 days are found in the Herbig Ae star HD 31648. Product Description popup.authors popup.nrat_date 2020-04-02 Close