COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1254

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 March 24


          PHOTOELECTRIC MINIMA OF AB And AND X Tri

I have observed AB And on seven nights, and X Tri on three
nights during the fall of 1976. A 30 cm Maksutov telescope was
used with an EMI 6256S photomultiplier tube and standard B,V
filters.
   Three primary and three secondary minima were obtained
for AB And, and two primary for X Tri. They are given in the
following:

AB And   Hel.Min.J.D.      Min.      O-C

         2442043.3047       II     +.0006
             043.4649       I      -.0007
             045.2941       II     -.0014
             049.4433       I      -.0008
             053.4262       I      -.0005
             128.2694       II     +.0009

   Quester's formula Min.I.= J.D.2436109.57928+0.33189215d E
(IBVS 190) was used in the calculation of O-C's.
   A detailed analysis of this system will be published  in
the "Communications de la Faculte des Science de L'Universite
d'Ankara, Serie A3: Astronomie, Annee 1977".

X Tri    Hel.Min.J.D.      Min.      O-C

         2443131.2753       I      -.0214
              32.2466       I      -.0215

   SAC 1977 formula Min.I.= J.D.2440984.2205+0.9715277d was used
in the calculation of O-C's.


                                  ZEKI TUFEKCIOGLU

                              Ankara University Observatory
                              A.U. Fen Fakultesi
                              Ankara - Turkey



                      [From IBVS 1300]


                 Corrigenda


I.B.V.S. No. 1254

Z. Tufekcioglu : Photoelectric Minima of AB And and X Tri

The table for AB And   should read:

Hel. Min. J.D.       m.e.     Min.     O-C
2443044.3047      +-.0006     II   +- .0099
    044.4694        .0004     I       .0036
    046.2941        .0008     II      .0029
    050.4433        .0015     I       .0035
    054.4262        .0004     I       .0038
    129.2694      +-.0007     II   +- .0052

The table for X Tri should read:

Hel. Min. J.D.       m.e.    Min.      O-C
2443132.2753      +- .0004    I    +- .0071
     33.2466      +- .0002    I    +- .0076


                [...]