... northern O and early B stars whose spectra could be obtained with the parameters required to look for variability at the using the CEGS echelle spectrograph, maintained at the coude focus of the 1-m Northern Caucasus Special Astrophysical Observatory (SAO) telescope (Musaev 1996). The list of the program stars includes 29 obiects. When choosing appropriate dates of observations, the program stars can be observed for almost the entire night. ...

... We also analyze Chandra X-ray archive data for the Mon R2 region and find IRS 3 A and IRS 3 C to be sources of hard (3 - 10 keV) and variable X-ray emission , suggesting plasma temperatures of at least 50 в 106 K. The similarity of the X-ray properties to those of Class I protostars suggests magnetic interaction between the protostars and their circumstellar disks to be the origin of the X-ray ... 2002). ... Upper Upper Lower Lower K-band Images of Mon R2 IRS 3. ... X-ray results. ...