COMMISSION 27 OF THE I.A.U.
              INFORMATION BULLETIN ON VARIABLE STARS
                           Number 1270

                                                    Konkoly Observatory
                                                    Budapest
                                                    1977 April 21


                PHOTOMETRY OF HD 153747

HD 153747 was found to be variable by McKay (1973) and
tentatively identified as a delta Sct star by McInally and McKay
(1977).
   We observed the star for five hours on the night of 1976
August 23 on the 60 cm telescope at the Mt John University 
Observatory. Observations were made using the multicolor photometer
described elsewhere (Bringans, Sullivan and Trodahl 1974), modified 
to include three discrete filters admitting 100 A wide bands
centered on 3400 A, 3500 A and 3600 A. The comparison star was
HD 153767.
   Because the amplitude of the light curve is relatively
small we have averaged our data over a number of bands, resulting 
in three approximately square effective transfer functions
covering the wavelength ranges of 3350 - 3650 A, 3900 - 4400 A
and 4550 - 5050 A. In order to minimize differential extinction
the averaging over adjacent passbands was done after making 
extinction corrections.
   The results are shown graphically in Figure 1. The amplitude 
in the blue band varied from about 0.01 magnitudes early in
the night to almost 0.04 magnitudes shortly before the star set.
The colour indices show little variation, though there is a
suggestion the star is bluer at maximum light than at minimum.


                        H.J. TRODAHL and D.J. SULLIVAN

                             Physics Department
                             Victoria University
                           Wellington, New Zealand



References:

Bringans, R.D., Sullivan, D.J., and Trodahl, H.J., 1974, P.A.S.P. 86, 693 [BIBCODE 1974PASP...86..693B ]
McInally, C,J, and McKay, B.J. 1977, IBVS, No. 1257
McKay, B., 1973, unpublished


                       [FIGURE 1]

 Fig. 1   Magnitude and colour variations

m_u, m_b, m_v refer to the magnitudes in the ultraviolet (3350 -
3650 A), blue (3900 - 4400 A) and visual (4550 - 5050 A) mentioned 
in the text.
The time is given relative to JD 2443010. All magnitudes given
are relative to the standard star.