COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1898

                                   Konkoly Observatory
                                   Budapest
                                   1980 December 28

                                   HU ISSN 0374-0676



           VYSS 124 AS A BY Dra VARIABLE


    The star Vyss 124 (AC +22d214-129, Yale 2399.1) was included
in the search program on red dwarfs of the I.T.A. Astronomical
Observatory (Ferraz-Mello, S. and Torres, C.A.O., 1971) due to
its hydrogen emission lines (Bidelmann, W.P., 1954). It was observed 
photoelectrically in B and V colours in 14 different nights,
against two comparison stars (BD +21d2173 and BD +20d2457). At
that time we found a rather large dispersion in the data.


                       [FIGURE 1]


           Figure 1a Light curve of Vyss 124


   We now reanalysed the data and used more refined period
search techniques. In both colours, and against both comparison
stars there appears a variation with a period of 8.05 days. Fig.1
shows the light curve using the first comparison star; it can be
seen that the amplitude is on the order of 0.1 mag. We note that
with a period of 8.05 days this star will be one of the slowest
BY Dra variables and it therefore deserves more attention. Nevertheless, 
an inspection of Fig. 1 shows that the points are not
well distributed in phase, so more observations are needed.
    Our adopted magnitudes and colour indices for the comparison 
stars were:

        BD +21d2173 V = 9.35m B-V = 1.17m
        BD +20d2457 V = 9.57  B-V = 1.35
    Eggen (1968) published photometric observations of Vyss 124
(V = 10.20, B-V = 1.365) which are fainter and bluer compared
with our results. The spectral classification of Joy and Abt (1974)
is dM0e, which is compatible with both measures. Gliese and
Jahreiss (1979) use Eggen's values to estimate a distance of 20
pc. Our results may imply that the star is nearer.


                            I.C. BUSKO
                            G.R. QUAST
                           C.A.O. TORRES

                      CNPq/Observatorio Nacional
                   Observatorio Astrofisico Brasileiro
                       37.500 - Itajuba - (MG)
                             Brasil




References:
Bidelman, W.P.,1954, Astrophys. J. Suppl. 1,175 [BIBCODE 1954ApJS....1..175B ]
Eggen, O.J., 1968, Astrophys. J. Suppl. 16,49 [BIBCODE 1968ApJS...16...49E ]
Ferraz-Mello, S. and Torres, C.A.O., 1971, I.B.V.S. No. 577
 [Originally: No. 770]
Gliese, W. and Jahreiss, H., 1979, Astron. Astrophys. Suppl. 38,423 [BIBCODE 1979A&AS...38..423G ]
Joy, A.H. and Abt H.A., 1974, Astrophys. J. Suppl. 28,1 [BIBCODE 1974ApJS...28....1J ]