COMMISSION 27 OF THE I. A. U.
           INFORMATION BULLETIN ON VARIABLE STARS
                       Number 2554

                                        Konkoly Observatory
                                        Budapest
                                        16 July 1984

                                        HU ISSN 0374-0676

          THE INVESTIGATION OF THE BINARY SYSTEM TX Cas

 The variability of TX Cas (BD +62d 480 = HV 2895) was discovered by Leavitt
(Pickering, 1907). McDiarmid (1915) first classified its Light curve correctly
as Beta Lyr - type. Though its variability is known over 70 years and the star
is relatively bright, only one photoelectric minimum by Fernandez (1982) was
obtained until now. Koch et al. (1979) called attention to the lack of 
photoelectric observations and recommended further study of the system.
 For this reason the star was put on the observational program at the 0.6 m
reflecting telescope of the Skalnate Pleso Observatory. The observations were
made in the standard B filter during four nights in 1982 and 1983, respectively.
The comparison stars BD +62d 485 and BD +62d 504 were used. The only part of
the light curve around primary minimum was observed. From our observations
three epochs of primary minima were determined using the tracing paper method.
These epochs of primary minima together with their limits of errors are
presented below:

        JD Hel.          E       O-C

 2445233.434           5128     +0.003
         +-5
 2445280.271           5144     -0.010
        +-10
 2445593.439           5251     +0.005
         +-3

 The O-C values were calculated using the ephemeris given by Ratz (1983):

     Min I = JD Hel. 2430224.512 + 2.9268563d x E

 It has been found that there is no significant difference from the above
mentioned ephemeris. However, the lack of the accurate observations before
those obtained by Fernandez (1982) and by us prevented the study of period
changes.


  J.M. KREINER
Institute of Physics
Silesian University
Katowice
Poland

  J. TREMKO
Astronomical Institute
Slovak Academy of Sciences
Tatranska Lomnica
Czechoslovakia

References:

Fernandez, M., 1982, BAV Mitt. Nr. 32
Koch, R.H., Wood, F.B., Florkowski, D.R., Oliver, J.P., 1979, IBVS No. 1709
McDiarmid, R.J., 1915, Astrophys.J. 42, 412 [BIBCODE 1915ApJ....42..412M ]
Pickering, E.C., 1907, Harv.Circ. No 127 [BIBCODE 1907HarCi.127....1L ]
Ratz, K., 1983, Mitt.Ver. Sterne 9, 169 [BIBCODE 1983MitVS...9..169R ]