COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1415

                                                     Konkoly Observatory
                                                     Budapest
                                                     1978 April 21


             OBSERVATIONS OF UV Pisc AND XY Cet

Observations of the above stars were recently made at the
Kottamia station of Helwan Observatory, Egypt (see also IBVS No. 1381).
The observations were made during a three-week period in October-
November, 1977, and standard stars were observed on a number of nights
during the period in order to relate the photometry to the standard
UBV system.
   Minima have been timed by an optimal curve fitting method -
the essential parameter which is involved for this purpose being the
small correction DeltaTheta_0 to bring the observed phases into correspondence
with the theoretical eclipse curves (Budding, 1973), e.g., see Fig. (1).
   The details are as follows:


(i)   UV Pisc (BD 6d189); Type G5 ; alpha = 1h14m.3; delta = 6d33' (1950).

Main comparison star (BD 6d197); Type G5; alpha = 1h16m.9; delta = 7d14' (1950)

UV Pisc: m_v(max) = 9m.21 +- 0m.03
         m_v(min I) = 10m.05 +- 0m.03;  (B-V)_out of eclipse = 0.85 +- 0m.02

Comp. star: m_v = 8.58 +- 0m.03 (B-V) = 1.07 +- 0m.02
Time of primary minimum:  HJD = 2443463.3493


(ii)   XY Cet. (BD +2d460); Type A0 ; alpha = 2h56m.9; delta = 3d19' (1950)

Main comparison star (+2d464); Type A3; alpha = 2h59m.1; delta = 3d21'

XY Cet: m_v(max.) = 8.65 +- 0m.02
        m_v (min I) = 9.54 +- 0m.02;  (B-V)_out of eclipse = 0.1 +- 0m.01

Comp. star: m_v = 8.63 +- 0m.02 (B-V) = 0.19 +- 0m.01
Time of primary minimum: HJD_0  = 2443453.3049

   An almost complete light curve of UV Pisc has been observed
(cf. IBVS No. 1381) and both minima of XY Cet have been fairly well
covered. More observations for XY Cet are planned for later this year.

                         [FIGURE 1]

Figure 1. Curve fitting to the primary minimum of XY Cet.


                           H. AL-NAIMIY, E. BUDDING
                           D. JASSUR, A.R. SADIK

                           Dept. of Astronomy
                           University of Manchester



Reference:

Budding, E., 1973, Astrophys. Space Sci., 22, 87 [BIBCODE 1973Ap&SS..22...87B ]