COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 1677

                                   Konkoly Observatory
                                   Budapest
                                   1979 September 26




        V794 AQUILAE - A NEW AN UMa-TYPE STAR ?



    V 794 Aquilae was detected by Hoffmeister (1936). Ahnert
(1949) believed that this star belongs to the group of long-
periodic variable stars.
    The spectrum was observed for the first time by Bond (1978),
who found "slightly diffuse hydrogen emission lines, superposed
on a blue continuum".
    I observed V794 Aql on about 200 plates of the Sonneberg
field 62 Aql taken between 1932 and 1979. The star shows a long-
time variability which on all levels of brightness is superposed
by fast variations (see light curve).

                        [FIGURE 1]

    The optical and spectroscopic behaviour of V794 Aql
resembles AN UMa (Meinunger 1976) and 2A 0311-227 (Griffiths
et al. 1979). The latter two stars are short-periodic binaries,
show soft X-ray emission (Hearn and Marshall 1979; Charles and
Mason 1979) and belong to a new group of variable stars, the
"polars" (Krzeminsky and Serkowski 1977).


                        [FIGURE 2]

 Photoelectric, spectroscopic and X-ray observations of
V794 Aql are therefore very desirable.



                           L. MEINUNGER  
                        Sonneberg Observatory of
                        Central Institute for Astrophysics
                        of Academy of Sciences of the GDR





References:

Ahnert, P., 1949, Veroff. Sternwarte Sonneberg 1, 208
Bond, H.E. 1978, PASP 90, 526 [BIBCODE 1978PASP...90..526B ]
Charles, P.A. and Mason, K.O., 1979, ApJ. 232, L25 [BIBCODE 1979ApJ...232L..25C ]
Griffiths, R.E. et al., 1979, ApJ. 232, L27 [BIBCODE 1979ApJ...232L..27G ]
Hearn, D.R. and Marshall, F.J., 1979, ApJ. 232, L21 [BIBCODE 1979ApJ...232L..21H ]
Hoffmeister, C, 1936, AN 259, 37 [BIBCODE 1936AN....259...37H ]
Krzeminsky, W. and Serkowski, K., 1977, ApJ. 216, L45 [BIBCODE 1977ApJ...216L..45K ]
Meinunger, L., 1976, I.B.V.S. No. 1168