Kholtygin A.F., Burlakova T.E., Fabrika S.N., Valyavin G.G., Yushkin M.V. Microvariability of Line Profiles in the Spectra of OB Stars: delta Ori A . ... We have studied variability of the spectral lines of the OB star delta Ori A -the brightest component of the delta Ori triple system. ... However, some of the variable features go outside the band, presumably due to either imhomogeneities in the stellar wind from .Ori Aa1 or non-radial pulsations of the weaker components of the system, Aa 2 or Ab. ...

... We explore the structures immediately surrounding the intermediate-mass young stellar object R Mon with bispec- trum speckle interferometry, conventional near-infrared imaging and by analyzing optical HST archive data. Our near-infrared speckle images with unprecedented diffraction-limited resolution of 55 mas (44 AU; H -band) and 76 mas (61 AU; K -band) represent the highest resolution R Mon images obtained so far and exhibit previously unseen complex structures. ... The features 1­5 are marked. ...