The X-, γ-, radio source LSI +61°303 has been studied in the optical range. Spectrograms have been used. A list of the main spectral lines is presented. Their parameters Wλ and Rc have been determined, radial velocities have been measured. Three-peak structure of the Hβ emission line has been detected. The spectral class is determined to be O9.7 and the absolute magnitude is Mv = -5m.2.
Astrofizicheskie Issledovaniia Izvestiya Spetsial'noj Astrofizicheskoj Observatorii
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