COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                    NUMBER 650

                                        Konkoly Observatory
                                        Budapest
                                        1972 March 31


        INTERMEDIATE-BAND AND H-BETA PHOTOMETRY 
            OF SHORT-PERIOD VARIABLE STARS


On seven nights in August, 1969, observations were made at Cerro Tololo
Inter-American Observatory in Chile on the following 13 stars, all of which are
either known short-period variables or are suspected of short-period
variability. The ubvy filters were of the standard type for use in Stromgren
intermediate - band photometry. The H-beta filters differed somewhat from
those used by Crawford, but the H-beta index has been standardized to that
given by Crawford et al. As comparison objects, a number of standard stars
were chosen from the lists of D.L. Crawford and J.V. Barnes and from the
catalogue of B. Stromgren and C. Perry.

In the following table, n refers to the number of separate occasions on which
each star was observed. For stars with appreciable amplitudes, the data refer
to the mean of the light curve.

Star                  b-y       m_1      c_1     beta    n

HR 242   rho Phe      0.222    0.208    0.771   2.730    4
HR 431                0.210    0.151    0.773   2.713    4
HR 515                0.176    0.167    0.966   2.776    6
HR 5005               0.202    0.165    0.803   2.718    6
HR 6581 omicron  Ser  0.055    0.174    1.090   2.891    4
HR 7020 delta Sct     0.207    0.206    0.831   2.714    4
HR 7340 rho Sgr       0.128    0.196    0.962   2.860    4
HR 7928 delta Del     0.195    0.163    0.835   2.758    4
HR 8006               0.180    0.174    0.811   2.781    4
BS Aqr                0.220    0.148    0.834   2.732   10
HD 9133               0.151    0.182    0.940   2.793    4
HD 116994             0.184    0.152    0.863   2.768   10
HD 199757             0.155    0.169    0.860   2.778   10


CARLSON R. CHAMBLISS
Department of Physical Sciences
Kutztown State College
Kutztown, Pennsylvania