COMMISSION 27 OF THE I. A. U.
       INFORMATION BULLETIN ON VARIABLE STARS
                    NUMBER 240

                                    Konkoly Observatory
                                    Budapest
                                    1967 December 27


             A LIKELY RRs VARIABLE IN SCORPIUS


The 13th-magnitude suspected variable CSV 2614=HV 10535 was estimated on about
200 plates in the Harvard Observatory collection. They were taken mostly
between JD 2427900-30133 with the 10-inch Metcalf triplet at Boyden, South
Africa. Exposures were 45 minutes, and the plate quality was usually good.

Variability was first noted by Emily Hughes Boyce (HA, 109, 2), who described
the star as of W UMa type, but gave no elements. Night runs revealed cycles of
about 0.1 day, and the mean light curve (Fig.1) indicated an RR Lyrae-type
star.

                            [FIGURE 1]


Fifteen normal maxima were obtained by fitting the mean light curve to the
individual observations. A weighted least squares solution gave these
elements:

JD_max hel=2429382.2570+0.^d10240124 E,
                   +-12         +-14 (m.e.)

with an average residual of 0.003 day.

The mean light curve range is m_pg=13.05-13.41, and M-m=0^P.38. However, since
the exposures spanned about 30 percent of the period, the true amplitude must
be considerably larger. Averages of the seven brightest and eight faintest
observations gave the range 12.87-13.51. At minimum, the standard deviation of
one estimate was 0.06 magnitude, but at maximum 0.13; perhaps there is a Blazko
effect.

                            [FIGURE 2]

Photoelectric observations are needed to improve these results, and the writer
would enjoy receiving such data. A finder chart is given in Fig. 2. The
approximate 1950 position of CSV 2614 is 16^h 10^m.2, -9d46', about 21'
north-east of Psi Scorpii.

It is planned to publish a more complete discussion in Variable Stars.


L.J. ROBINSON

"Sky and Telescope"
49 Bay State Road
Cambridge, Mass. 02138
U.S.A.