28 mars 2010

Cette étoile Oe magnétique, O?fpe a un comportement étrange, un appel à contribution est lancé. On ne connait qu'une poignée d'étoiles O de ce type et celle ci est entouré d'un disque qu'elle contraint par son fort champs magnétique. On observe de fréquentes éruptions en Ha dont on essaye de connaître la régularité. Enfin si il y en a une... Very strange behavior of this O?fpe star. frequent outburst occured at regular interval. It is necessary to constrain a period, more observations are needed. Aras link, lien vers la page d'aras... [Lire la suite]

Last spectra of Be stars after two weeks of bad weather. Some different aspect of the Ha line profile depending of the Be activity and sight of view, pole on or equator. Gam Cas,mV 2.39 B0IVpe HD57682, mV 6.4 O9Ve, HD70340, mV 6.4 A2Vnnpe HD112028, mV 5.3 A1IIIshe HD142926, mv 5.74 B9pe Most of the spectrum are made in binnig2X2. Only the bright gam cas was made in binning 1X1 mode. The dispersion is twice in Bin2 than in Bin1 for the same resolution, around 15000 here. Slit is 35µm large and ccd pixel are 6,4µm. SNR for... [Lire la suite]