Spectral variations of Ae–Be Herbig stars in the Mon R1 association.

We present the change in the Ha emission-line profile of the spectra of some Ae–Be Herbig stars. In the spectrum of VY Mon, Ha may have one of three profile types: P Cyg, P Cyg III or single line in accordance with the brightness variations of the star. HD259431 now shows a double Ha profile with the red component stronger than the blue component, while in the earlier observations the blue peak was higher than the red peak. Finally, the last Ha profile of LkHa215 is very similar to that obtained by Finkenzeller et al . [ABSTRACT FROM AUTHOR]