COMMISSION 27 OF THE I. A. U.
          INFORMATION BULLETIN ON VARIABLE STARS
                      Number 2074

                                   Konkoly Observatory
                                   Budapest
                                   1982 January 21

                                   HU ISSN 0374-0676




       PHOTOELECTRIC LIGHT CURVE OF 44 BOOTIS





  A complete light curve of the W UMa-type eclipsing binary 44
Boo was obtained on the night of 8-9 May, 1982. The observations
were made on the No. 3 40 cm telescope at Kitt Peak National
Observatory. A dry-ice cooled 1P21 photomultiplier and pulse-
counting system were used to make the observations in the V band
of the UBV system. Observations were made relative to the 
comparison star 47 Boo.

   Observations of the close pair 27/28 LMi provided data for
transformation to the standard UBV system. Analysis of the 
comparison star magnitude versus air mass provided a measure of
extinction. Observational times were calibrated with respect to
radio station WWV to within 0.1 seconds. All integrations were
of 10 seconds duration, and the observations were made in the
following order: 6 of the comparison star; 3 of the comparison
star background; 60 of the variable star; and 3 of the variable
star background; etc. A neutral density filter was used to limit
the maximum counts to approximately 200,000 for the 10-second
integrations.
  The data were reduced at the Fairborn Observatory using the
BASIC program described by Genet (1980). This included correction 
for differential extinction, transformation to the standard
system and heliocentric correction of the observational times.
Approximately 1500 10-second observations of the variable star
were made in about seven hours. These data were grouped and mean
counts for each seven observations were used in the analysis.

The phase was calculated using the ephemeris of van't Veer (1972).


                       [FIGURE 1]


      Pr. Min. = Hel. J.D. 2439370.4222 + 0.2678160 E


  The resultant light curve is shown in the figure. The data
are available as IAU 27 File No. 89. The persistence of certain
irregularities in the light curve are being examined with respect
to observations made on nights prior to and subsequent to the
night's observations reported herein.


R. M. GENET            K. E. KISSELL      G. C. ROBERTS
Fairborn Observatory   2202 Malton Ave.   9625 Bellanca Ave.
1247 Folk Road         Simi Valley        Los Angeles
Fairborn, Ohio         California         California
45324 USA              93063 USA          90045 USA





References:
Genet, R. M.: 1980 IAPPP Communications, 2, 23. [BIBCODE 1980IAPPP...2...23G ]
van't Veer, F.: 1972, Astron. & Astrophys., 20, 131. [BIBCODE 1972A&A....20..131V ]


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