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One of the most prominent features of young objects in the optical range isthe presence of emission lines, in particular Ha at 6563A. Therefore, Haemission is the most common spectroscopic means for identifying young stars. Wepresent the search's results of PMS stellar objects in the several star formingregions carried out on 2.6 m telescope in Byurakan observatory. We have usedthe method of slit-less spectroscopy employing a grism in combination with anarrow-band Ha interference filter to detect the objects with Ha emission.

The search and study of PMS stars with Ha emission