Influence of stellar wind on the long-term variability of the Hα emission line. The case of the Herbig Ae-star HD 31648

The results of high-resolution long-term spectral monitoring in the region of the emission Ha line of the Herbig Ae star HD 31648 are reported. The variability in the observed profile is shown to be caused mainly by a change in the parameters of outflowing circumstellar gas over a time scale of about 3 years. __________ Translated from Astrofizika, Vol. 49, No. 1, pp. 81–90 (February 2006).