Non-Periodic Phenomena in Variable Stars
                                       IAU Colloquium, Budapest, 1968


      EMISSION H alpha-LINE PROFILES IN SEVERAL T TAU STARS


                    E. A. DIBAJ and V. F. ESIPOV

          Sternberg State Astronomical Institute, Moscow

  The emission H alpha-line profiles in T Tau stars were observed by L. Kuhi, 
who proposed an expanding mass-loss envelope model (Astrophys. J. 140, 
1465, 1964; 143, 991, 1966).
  In October 1967 observations of eight stars associated with nebulosities 
were carried out with the 50-inch reflector using an image-tube spectrograph 
(dispersion 25 A/mm, resolution 1 A).
Fig. 1-9 show the H alpha-line profiles for the stars T Tau, RY Tau, FU Ori, 
V 380 Ori, R Mon, Z CMa, BD +40 4124, Lk H alpha 215 and for comparison 
the absorption H alpha-line in an A0V type spectrum.

  

                     Fig. 1. H alpha-line profile for T Tau


  

                     Fig. 2. H alpha-line profile for RY Tau

  It appears that motions in the mentioned stars are more complicated than 
pure expansion. We observe the expanding envelopes with self-absorption 
(FU Ori, Z CMa), the rotating envelopes ("pole-on-star" V 380 Ori and 
"shell-star" Lk H alpha 215) and intermediate cases (T Tau, RY Tau, R Mon 
BD +40 4124).

  The authors are planning further observations to detect possible spectral 
variability.

  

            Fig. 3. H alpha-line profile for FU Ori

  

            Fig. 4. H alpha-line profile for V 380 Ori

  

            Fig. 5. H alpha-line profile for R Mon

  

            Fig. 6. H alpha-line profile for Z CMa

  

            Fig. 7. H alpha-line profile for BD +40 4124

  

            Fig. 8. H alpha-line profile for Lk H alpha 225

  

            Fig. 9. Absorption H alpha-line in an A0V type spectrum