COMMISSION 27 OF THE I. A. U.
            INFORMATION BULLETIN ON VARIABLE STARS
                        Number 2448

                                              Konkoly Observatory
                                              Budapest
                                              20 December 1983

                                              HU ISSN 0374-0676



                      A NOTE ON X TRIANGULI



  Photoelectric observations of some eclipsing variable stars were carried
out at the Kryonerion Astronomical Station of the National Observatory of
Athens during September 1983. The observations were made using a two-beam,
multi-mode, nebular-stellar photometer attached to the 48-inch Cassegrain
reflector.
  The eclipsing binary X Tri was observed on 16/17 September. Then, at U.T.=
22h50m (J.D. - 2445594.4550) a flare like phenomenon was detected.
  Figure 1 gives the observed Delta m (in V) against Hel. J.D. As one can notice


                              [FIGURE 1]


from it, there are two maxima and the whole phenomenon lasted for almost 35
minutes. Using the ephemeris:

         Min I (Hel. J.D.) = 2437572.1994+0.9715382d E

(Kukarkin et al. 1969) the observed phenomenon corresponds to phases
0.2725 - 0.2975.
  Photoelectric observations of X Tri will be continued firstly to obtain
a complete light curve and secondly to find out if the observed phenomenon
would be repeated, since an observable mass transfer appears in the system
(Mallama, 1975).





P. ROVITHIS            H. ROVITHIS-LIVANIOU
National Observatory   Astronomy Department
of Athens              Panepistimiopolis
Athens (306)           Athens (621)
GREECE                 GREECE





References:
Kukarkin, B.V, et.al.: 1969, General Catalogue of Variable Stars, Moscow [BIBCODE 1969gcvs.book.....K ]
Mallama, A.: 1975, Acta Astron. 25, 205 [BIBCODE 1975AcA....25..205M ]