COMMISSION 27 OF THE I. A. U.
        INFORMATION BULLETIN ON VARIABLE STARS
                    Number 3428

                                       Konkoly Observatory
                                       Budapest
                                       1 February 1990

                                       HU ISSN 0374 - 0676


    New times of maxima for CY Aqr, DY Peg and BL Cam (1)

     CY Aqr and DY Peg are two of the most observed stars
belonging to the SX Phe type stars. There are some doubts about
their period variations and different interpretations can be found in
the literature. In order to facilitate this interpretation new times
of maxima are presented here, together with other new ones for
the star BL Cam.

 These new photoelectric observations were secured for CY Aqr
and DY Peg in August 1986 at the Sierra Nevada Observatory in
Spain, using the 75 cm telescope with simultaneous observations
of uvby Stromgren filters. A new set of observations was carried
out for BL Cam in October 1988 at Calar Alto Observatory in
Spain using the 1.52 m telescope and, this time, a sequential uvby
Stromgren filters were used and a classical cooled single-channel
photometer.


  TABLE 1. Times of maxima of CY Aqr, DY Pep and BL Cam.

     CY Aqr       DY Peg        BL Cam
 i   Ti(HJD)      Ti(HJD)       Ti(HJD)
     2400000. +   2400000. +   2400000. +

 1   46648.4872   46653.4688   47439.6697
 2   46648.5479   46653.5419   47440.6760
 3   46648.6095   46653.6150   47441.5360
 4   46649.4631   46654.4168   47441.5759
 5   46649.5242   46654.4901   47442.5529
 6   46649.5856   46654.5619   -
 7   46650.5617   46654.6352   -
 8   46650.6231   46655.6571   -
 9   46651.4178   46656.4581   -
10   46652.5068   46056.5313   -
11   46652.5765   46656.6052   -
12   46652.6375   -            -



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 (1) Partially based on observations collected by using the 1.5 m telescope from the Observatorio
Astronomico Nacional at Calar Alto Observatory, Almeria, Spain


  These new times of maxima have been calculated using the
method described in Rodriguez et al. (1989). In total, 28 new
times of maxima have been obtained for the three stars and they
are listed in Table 1 in Heliocentric Julian Day.


                   E. RODRIGUEZ
                   A. ROLLAND
                   P. LOPEZ DE COCA

            Instituto de Astrofisica de Andalucia
                Apdo. 2144, Granada, Spain



REFERENCE


Rodriguez, E., Lopez de Coca, P., Rolland, A. and Garrido, R. 1989,
   Rev. Mex. Astron. Astrofis. (submitted)